PRR Signal Standard Plans

Here is a partial list of PRR standard plans relating to signaling. Plans that I have copies of have the revision code for the revision that is online. Plans that I don't have copies of have "needed" as the revision. If you have a copy of any needed plans or better quality copies of plans I have online, please let me know!

Plans numbered from 100-599 describe physical parts of the signaling system.
Plans in the 600 series plans are keys to reading other plans and interlocking diagrams
Plans in the 800 series plans document the electrical operation of the signaling system.

Thank you to Pat McKinney for loaning me his standards book to scan! Also thank you to Robert Fredland for photocopying his 8xx series plan book and C.E. 234!

A related documents is: C.E. 234-b, "Specifications for Signal and Interlocking Systems" which refers to and has links to many of these plans.

Note that some of these plan files are fairly large and may take a while to download.

Note that these files require Adobe's Acrobat Reader. It's free, just go to http://www.acrobat.com to download it.

Sorted ascending by Latest revision date

Plan # Revision Title Rev date Railroad C of

S-427 needed Signal Supports for Catenary Poles 1/1/1900 - -

S-117 needed Instrument Case 1/1/1900 - -

S-800 needed Dimensions of Signal Circuit Plans 1/1/1900 - -

S-425 needed Signal Supports for Bridge 1/1/1900 - -

EMW150 - Specifications for Installation of Automatic Signals and Electric Circuits 1/12/1909 PRR RS

SigPipe _ Specifications for One-Inch Signal pipe and Couplings 4/1/1909 RS

208-S6 1 Four hole insulating Rail Joint, Type ''k" for P.S. Rail Section (drilled 5, 4-1/2 & 6 in. per plan 59472 & 59476) 6/29/1909 PRR RS

208-S7 1 Four hole insulating Rail Joint, Type ''k" for P.S. Rail Section (drilled 5-1/2 & 7-1/4 & 6 in. per plan 59480) 6/29/1909 PRR RS

208-S5 1 Four hole insulating Rail Joint, Type ''k" for P.S. Rail Section (drilled 4,5 & 6 in. per plan 59464 & 59468 6/29/1909 PRR RS

217-S1 1 Gauge of distance between magnet Core & armature of electro- pneumatic switch and signal magnets 7/29/1909 PRR RS

200-S2 0 Mechanical Interlocking Machine 8/17/1909 PRR RS

200-S3 0 Mechanical Interlocking Machine 8/17/1909 PRR RS

200-S4 0 Mechanical Interlocking Machine 8/17/1909 PRR RS

210-S3 1 Details of front & Lock Rods 9/14/1909 PRR RS

207-S3 1 Mechanically operated deflector Bar 1/3/1910 PRR RS

207-S4 0 Deflector bar Driving Piece 1/5/1910 PRR RS

227-S2 0 Plunger lock for mechanically operated Switches 1/5/1910 PRR RS

207-S2 3 Rail Clips for 3/8" Mechanically operated detector bars P.S. Rail Section 2/14/1910 PRR RS

207-S1 2 Rail Clips for 3/8" Mechanically operated detector bars, P. R. R. Rail Section 2/14/1910 PRR RS

EMW50 - Specifications for Rubber Insulated Signal Wires and Cables 5/1/1910 PRR RS

250-S1 0 4 lb. Gravity battery zinc 8/30/1910 PRR RS

242-S1 1 Flange Union 10/13/1910 PRR RS

246-S1 1 Stop Board 1/31/1912 PRR RS

263-S4 2 4 hole one end insulated rail joint type ''w" for P.S. rail section 1/30/1913 PRR RS

263-S2 1 6 hole one end insulated rail joint type ''w" for P.S. rail section- (drilled 4, 5 &6in. per plans 59464 & 59468) 1/31/1913 PRR RS

263-S3 1 6 hole one end insulated rail joint type ''w" for P.S. rail section- (drilled 5, 4-1/2 &6in. per plans 59472 & 59476) 1/31/1913 PRR RS

208-S4 2 Four hole insulating Rail Joint, Type ''k" for P. R.. R. Rail Section 9/28/1913 PRR RS

249-S1 2 Caustic soda primary battery 1/5/1914 PRR RS

218-S1 1 Six hole insulating Rail Joint type "W" for P. R.. R. Rail Section 2/13/1914 PRR RS

218-S2 2 Six hole insulating Rail Joint type "W" for P.S. Rail Section (drilled 4,5&6 in. per plan 59464 & 59468) 2/13/1914 PRR RS

218-S3 2 Six hole insulating Rail Joint type "W" for P.S. Rail Section (drilled 5,4-1/2&6 in. per plan 59472 & 59476) 2/13/1914 PRR RS

218-S4 1 Six hole insulating Rail Joint type "W" for P.S. Rail Section (drilled 5- 1/2 &7-1/4 in. per plan 59480 & 59854) 2/20/1914 PRR RS

241-S3 1 Aspects of signals outside automatic signal limits 2/24/1914 PRR RS

241-S4 1 Aspects of signals within automatic signal limits 2/24/1914 PRR RS

208-S2 2 Six hole insulating Rail Joint, Type ''k" for P.S. Rail Section (drilled 4,5 & 6 in. per plan 59464 & 59468 9/28/1914 PRR RS

208-S1 2 Six hole insulating Rail Joint, Type ''k" for P. R.. R. Rail Section 9/28/1914 PRR RS

208-S3 2 Six hole insulating Rail Joint, Type ''k" for P.S. Rail Section (drilled 5, 4-1/2 & 6 in. per plan 59472 & 59476) 10/7/1914 PRR RS

204-S4 _ Vertical Cranks 10/15/1914 PRR RS

RightLine _ Instructions and Specifications for right-line Signal Plans 1/1/1915 PRR RS

301-S7 - Details of signal masts and parts 4/14/1915 PRR RS

301-S6 0 Details of signal masts and parts 4/14/1915 PRR RS

300-S5 0 Three arm power operated interlocked signal 5/10/1915 PRR RS

301-S1 3 Details of signal masts and parts 5/10/1915 PRR RS

301-S4 1 Details of signal masts and parts 5/10/1915 PRR RS

301-S2 1 Details of signal masts and parts 5/10/1915 PRR RS

268-S1 - Vertical deflecting stand 5/12/1915 PRR RS

271-S1 - Mechanical dwarf signal 6/17/1915 PRR RS

301-S5 0 Details of signal masts and parts 6/22/1915 PRR RS

272-S2 - Suspended signal details 7/19/1915 PRR RS

216-S2 - Plan of Manard Rail plugged for signal bonding (drilled as per plan 61200 7/27/1915 PRR RS

303-S1 - Bracket post 12/29/1915 PRR RS

241-S5 0 Position light signal aspects [old style 4 bulb] 2/14/1916 PRR RS

269-S1 - Multiple unit bolt lock 3/28/1916 PRR RS

265-S1 - Insulating Rail Joint-Type "W. D. A." for 100 lbs., 125 lbs. & 130 lbs. Rails 5/15/1916 PRR RS

266-S2 - Details of battery chutes 1/8/1917 PRR RS

218-S5 - Six hole insulating Rail Joint type W1 for 85 lb. P.S. Rails 1/14/1917 PRR RS

218-S6 - Six hole insulating Rail Joint type W1 for 85 lb. P.S. Rails 2/14/1917 PRR RS

218-S7 - Six hole insulating Rail Joint type W1 for 85 lb. P. R. R.. Rails 2/15/1917 PRR RS

206-S2 _ One Inch pipe line Insulation 2/16/1917 PRR RS

224-S1 - Mechanical switch layout- application to single switch 3/7/1917 PRR RS

206-S3 _ Solid and Adjustable Links 3/9/1917 PRR RS

237-S1 - Tie straps 3/22/1917 PRR RS

224-S2 - Mechanical switch layout- application to single switch 3/26/1917 PRR RS

305-S2 - Mechanism for operating mechanical distant switch signal 4/11/1917 PRR RS

310-S2 2 Arrangement of mechanical ground slots 4/11/1917 PRR RS

305-S1 - Layout of facing point switch controlling mechanical distant switch 4/11/1917 PRR RS

272-S1 - Suspended signal 4/11/1917 PRR RS

310-S1 1 Arrangement of mechanical ground slots 4/12/1917 PRR RS

253-S2 4 Arrangement of non-interlocked crossover protected by switch target 4/13/1917 PRR RS

253-S3 5 Arrangement of non-interlocked crossover protected by switch target 4/13/1917 PRR RS

253-S1 4 Arrangement of non-interlocked crossover protected by switch target 4/13/1917 PRR RS

206-S1 _ Jaws, Adjusting Screws and Links 4/26/1917 PRR RS

225-S1 - Mechanical switch layout- application to single switch 5/9/1917 PRR RS

202-S1 _ Up and down Rods for mechanical Interlocking Machines 6/6/1917 PRR RS

254-S1 2 Arrangement of non-interlocked crossover protected by switch target- details 6/7/1917 PRR RS

226-S1 0 Mechanical switch layout- application to two single switches 7/10/1917 PRR RS

205-S2 _ Compensation Tables, With Typical Layouts 7/10/1917 PRR RS

200-S1 1 Mechanical Interlocking Machine 8/21/1917 PRR RS

228-S1 - Mechanical switch layout application to two Single switches 5 ft. to 10 ft. between points 8/26/1917 PRR RS

228-S2 - Mechanical switch layout application to two single switches 9/18/1917 PRR RS

274-S1 - Four hole "Continuous" insulating rail joint-for 125 lbs. and 130 lbs. P.S. rails 9/24/1917 PRR RS

265-S2 - Four hole "Troy" insulating rail joint-for 100 lbs., 125 lbs. and 130 lbs. P. S. rails 9/28/1917 PRR RS

210-S5 2 Details of front & Lock Rods 10/26/1917 PRR RS

210-S6 2 Details of front & Lock Rods 11/10/1917 PRR RS

233-S1 - Mechanical switch layout- application to M. P. frogs 1/28/1918 PRR RS

230-S2 - Flag station and permissive Signal lamp 2/11/1918 PRR RS

266-S1 1 Battery Chutes 2/26/1918 PRR RS

218-S8 - Four hole insulating Rail Joint type W1 for 85 lb. P.S. Rails 3/1/1918 PRR RS

275-S1 - Four hole insulating rail joint type "B"-for 100 lbs., 125 lbs. and 130 lbs. P. S. rails 3/11/1918 PRR RS

221-S1 - Trunking and conduit 6/5/1918 PRR RS

300-S1 - Power operated manual block signal 6/28/1918 PRR RS

300-S2 - Automatic block signal 6/28/1918 PRR RS

300-S7 - Power operated distant signal 6/28/1918 PRR RS

300-S3 - Automatic block signal 6/28/1918 PRR RS

300-S6 - Power operated distant signal 6/28/1918 PRR RS

300-S4 - Power operated interlocked signal 6/28/1918 PRR RS

301-S3 2 Details of signal masts and parts 7/1/1918 PRR RS

304-S2 - Power operated interlocked signal 7/30/1918 PRR RS

304-S3 - Power operated automatic block signal 7/30/1918 PRR RS

304-S4 - Power operated automatic block signal 7/30/1918 PRR RS

304-S5 - Power operated distant signal 7/30/1918 PRR RS

304-S6 - Power operated distant signal 7/30/1918 PRR RS

304-S1 - Power operated manual block signal 7/30/1918 PRR RS

208-S8 _ Insulating Rail Joint- Type ''k" for 100 lbs., 125lbs. & 130lbs. P.S. Rail 9/1/1918 PRR RS

301-S8 - Permissive signal spectacles 9/17/1918 PRR RS

210-S1 3 Front and Lock Rods 9/28/1918 PRR RS

210-S2 _ Front and Lock Rods 9/28/1918 PRR RS

301-S9 2 Details of signal masts and parts 12/28/1918 PRR RS

231-S1 - Mechanical switch layout- application to Single slips and M. P. frogs 1/22/1919 PRR RS

232-S1 - Mechanical switch layout- application to Single slips and M. P. frogs 2/27/1919 PRR RS

215-S2 - Switch operating Rods 3/18/1919 PRR RS

243-S3 0 Mechanical switch layout- application of type ''G" S. & L. movement 3/18/1919 PRR RS

278-S1 - Sign for unattended block station 3/25/1919 PRR RS

227-S1 - plungers & base plates- for mechanically operated switches 4/25/1919 PRR RS

SK-1082 - Approach Sign indicating Railroad Ahead 7/21/1919 PRR RS

248-S1 2 Fibre Tags for wire numbering 11/13/1919 PRR RS

312-S1 - Position light signal units and masts [old style 4 light] 1/5/1920 PRR RS

244-S1 2 Flag station signal 2/6/1920 PRR RS

244-S2 3 Flag station signal 2/6/1920 PRR RS

279-S1 - Flag station light signal 2/6/1920 PRR RS

210-S4 3 Front & Lock Rods 2/19/1920 PRR RS

S-139 A Pipe Carrier Parts 5/24/1920 PS PM

S-118 A Jaw Parts 6/4/1920 PS RS

S-160 A Deflecting Bars and Stand-Horizontal adjustable 6/4/1920 PS PM

S-107 A Crank and Stands, One and Two Way Vertical 6/8/1920 PS PM

S-524 A Shields for dwarf signals 6/24/1920 PS RS

S-265 A Duplex switch lock 8/2/1920 PS PM

S-121 A Jaws and Lugs 8/2/1920 PS RS

S-122 A Pipe adjusting Screw 8/4/1920 PS PM

S-485 A Blade Grip Parts for semaphore signals 9/29/1920 PS RS

S-473 A Signal, Color Light Scale 1/5/1921 PS PM

S-460 A Signal parts, one and two-way flag stations 4/8/1921 PS RS

S-175 A Channel Pins 4/26/1921 PS RS

S-167 A Leadout foundation Rocker Shaft 4/29/1921 PS PM

S-170 A Leadout Foundation parts- for Rocker Shaft Leadout 4/29/1921 PS PM

S-131 A Expansion Joint Parts 6/30/1921 PS RS

S-154 A Rocker Shaft and arms 9/2/1921 PS PM

S-509 A Battery well and box 9/2/1921 PS PM

S-153 A Bearings and parts- Rocker Shaft 9/2/1921 PS PM

S-256 A Plunger Lock 12/14/1921 PS PM

S-255 A Plunger Lock and Circuit Controller 2/11/1922 PS PM

S-228 A Arrangement for Locking Non-Interlocked Crossover Protected by Signal 2/20/1922 PS RS

S-510 A Battery boxes 3/6/1922 PS RS

S-508 A Battery Well 3/6/1922 PS PM

S-400 B Signals, Position Light 5/10/1922 PRR RS

S-206 A Layouts for Derails, Type "G" Mechanism 5/31/1922 PS PM

S-537 A Sectionalizing Case and Foundation 6/14/1922 PS PM

S-130 B Expansion Joint and Flange Union 8/2/1922 PS PM

S-522 B Blocking Devices for Interlocking Machine Levers 9/22/1922 PS PM

S-487 B Roundels & Lenses, for semaphore signals 10/18/1922 PS RS

S-201 B Layout, Single Switch, Type "G" Mechanism 10/18/1922 PS RS

S-550 A Anchor and Boxes for Air Line 2/7/1923 PRRS PM

S-112 B Pipe Compensator, One-Way Horizontal 2/9/1923 PRR PM

S-186 B Trunking and Capping 3/6/1923 PRRS RS

S-483X A Incandescent Electric Lamps Not shown on Standard Plan S-483 Temporarily Approved for use in Signal Service 4/12/1923 PRR RS

S-580 A Tools and Gauge 4/27/1923 PRRS PM

S-207 A Layouts for Derails, Type "A1" Mechanism 6/8/1923 PRRS PM

S-483X B Incandescent Electric Lamps Not shown on Standard Plan S-483 Temporarily Approved for use in Signal Service 7/9/1923 PRR RS

S-308 A Front and Lock Rods 7/11/1923 PRRS RS

IDX _ Index, Standard Signal Material Plans and Specifications 10/1/1923 PRR RS

S-477 B Lamp, Oil Lighted Signal 10/12/1923 PRRS PM

RevNot2 _ Revision notice-S-528-C, S-400-C, S-401-B, S-482-A, S-483-B 11/20/1923 PRR RS

S-454 B Train Order Signals 2/18/1924 PS PM

S-547 A Monogram for marking tools, lanterns, tinware etc. 3/3/1924 PRRS RS

S-486 B Cover Glasses and Lenses for Position and other Light Signals 3/6/1924 PS PM

S-309 B Front and Lock Rods for M. P. Frogs 4/3/1924 PRRS RS

S-325 B Front rod parts for M. P. frogs 4/3/1924 PRRS RS

S-531 C Instrument Case 4/12/1924 PS PM

S-821 _ Circuits for Electro-Mechanical Switches 5/7/1924 PRR RF

S-203 A Layout, M.P. Frogs Type "G" Mechanism 5/12/1924 PRRS PM

S-333 A Operating rods for double slip switches 5/12/1924 PRRS RS

S-335 A Operating rods for M. P. frogs 5/12/1924 PRRS RS

S-484 C Blades for Semaphore Signals 6/2/1924 PRRS PM

RevNot1 _ Revision notice-S-179C, S-477-B, S-528-B, 489-B 6/17/1924 PRR RS

S-511 A Battery boxes 6/23/1924 PRRS PM

S-480 C Lamp for Flag Station and Unattended Block Station Signals 7/25/1924 PRRS PM

S-464 B Sign, for unattended block station 7/31/1924 PS RS

S-234 A Arrangement for Locking Non-Interlocked Crossover Protected by Signal 9/11/1924 PRRS PM

S-235 A Arrangement for Locking Non-Interlocked Crossover Protected by Signal 9/11/1924 PRRS PM

S-513 B Terminal Blocks 10/21/1924 PS PM

SK-12 B Locking and Sealing Device for Electric Lock 11/17/1924 PRRS PM

S-503 A Zinc for gravity battery 11/25/1924 PRRS RS

S-479 C Lamps 1/29/1925 PRRS PM

S-221 A Switch Circuit Controller 3/4/1925 PRRS RS

S-256 B Plunger Lock 4/22/1925 PS RS

S-321 E Front rod parts 8/6/1925 PRR RS

S-405 A Signals, Position Light 8/31/1925 PRRS PM

S-323 C Front rod parts for slip switches 9/18/1925 PRRS RS

S-233 B Arrangement for Locking Non-Interlocked Turnout Protected By Signal 10/9/1925 PRR PM

S-482 B Lamp Details for Oil Lighted Switch and Signal Lamps 1/7/1926 PRR PM

S-200 C Layout, Single Switch, Type "G" Mechanism 2/16/1926 PRR PM

S-311 D Lock Rods 2/23/1926 PRR RS

S-150 B Down Rod for Electro-Mechanical Interlocking Machines 3/15/1926 PRR PM

S-201 C Layout, Single Switch, Type "G" Mechanism 4/16/1926 PRR PM

S-406 A Signals, Position Light 5/14/1926 PRR PM

S-806 _ Contact Arrangement of Alternating Current Relays 6/7/1926 PRR RF

S-481 A Electric Lamp Parts 9/7/1926 PRR PM

S-478 C Electric Lamp for semaphore signals 9/7/1926 PRR PM

S-229 B Arrangement for Locking Non-Interlocked Crossover Protected by Signal 10/9/1926 PRR RS

S-136 B Pipe for Signals and Interlocking 10/18/1926 PRR PM

S-260 A Switch Mechanism, Hand Operated 10/26/1926 PRR PM

S-210 B Layout, Single Switch Type, ''A-1" Mechanism 10/28/1926 PRR RS

S-211 B Layout, Single Switch,Type "A-1" Mechanism 10/28/1926 PRR PM

S-483 C Incandescent Electric Lamps 11/8/1926 PRR PM

S-410 B Signal, Position Light Dwarf 11/9/1926 PRR RS

S-232 B Arrangement for Locking Non-Interlocked Turnout Protected by Signal 11/9/1926 PRR RS

S-231 B Arrangement for Locking Non-Interlocked Crossover Protected by Signal 11/26/1926 PRR RS

S-140 B Pipe Carriers 11/26/1926 PRR RS

S-230 B Arrangement for Locking Non-Interlocked Crossover Protected by Signal 11/26/1926 PRR RS

S-138 C Pipe Carrier Parts 11/26/1926 PRR RS

S-202 B Layout, Double Slip Switch Type "Q" Mechanism 12/3/1926 PRRS PM

S-407 A Ladder and Masts for Position Light Signals 12/6/1926 PRR PM

S-847 _ Control Circuits for 110 V.A.C. "T2" Motor Signals 12/14/1926 PRR RF

S-236 C Lever and Stand 12/15/1926 PRR PM

S-258 D Switch Mechanism, Type "G" 12/23/1926 PRR PM

S-871 _ Control Circuits for Controlled Manual Block 12/30/1926 PRR RF

S-497 C Foundations, for Position Light Signals and Instrument Cases 1/26/1927 PRR PM

S-487 C Roundels & Lenses, for semaphore signals 2/8/1927 PRR PM

S-182 F Track Circuit Connections 2/16/1927 PRR RS

S-403 B Ladder Parts for Position Light Signals 2/17/1927 PRR PM

S-404 B Ladders for Position Light Signals 2/17/1927 PRR PM

S-220 D Switch Circuit Controller Connection 2/21/1927 PRR PM

S-458 B Signals, one and two-way flag station 2/23/1927 PRR RS

S-457 C Signal, Color Light Flag Station 2/23/1927 PRRS PM

S-459 B Signal parts, one and two-way flag stations 2/23/1927 PRR RS

S-528 C Eyelets and tags 3/14/1927 PRR RS

S-490 A Numerals and Letters for Signal Numbering 5/2/1927 PRR PM

S-864 _ Local Circuits for Motor Distant Signals 5/19/1927 PRR RF

S-863 _ Local Circuits for Motor Interlocking & Block Signals 5/19/1927 PRR RF

S-489 D Numerals and Letters for signal numbering 6/3/1927 PRRS RS

S-555 B Atmospheric Aftercooler and Drip Feed 6/20/1927 PRR PM

S-548 A Locking and Sealing Devices 6/20/1927 PRR PM

S-305 E Front and lock rods for single switches 6/27/1927 PRR RS

S-311 E Lock Rods 7/5/1927 PRR RS

S-217 A Layout, Single Switch, Style "M" Mechanism 7/5/1927 PRR PM

S-115 B Foundations for Pipe Carriers and Instrument Cases 7/27/1927 PRR RS

S-545 E Marker for Grade Signal 8/23/1927 PRR RS

S-500 B Battery, caustic soda primary 8/31/1927 PS RS

S-825 _ Route Locking Circuits 9/20/1927 PRR RF

S-408 B Instrument Cases and Bases for Signal Masts 9/21/1927 PRR PM

S-867 _ Control Circuits for Position Light Dwarf Signals 9/30/1927 PRR RF

S-179 G Rail Bonds and clips (Sheet 1/1) 11/7/1927 PRR RS

S-400 E Signals, Position Light 11/10/1927 PRR PM

S-183 B Track Circuit Connection 11/10/1927 PRR RS

S-452 A Take Siding Indicator for Placing on Block Stations 11/18/1927 PRR PM

S-212 A Layout, Slip Switch,"A1" Mechanism without Cylinder 11/22/1927 PRR PM

S-213 A Layout, M.P. Frogs, Type "A1" Mechanism 11/22/1927 PRR PM

S-214 A Layout, Slip Switch, "A1" Mechanism with Cylinder 11/22/1927 PRR PM

S-116 C Foundation for Compensators and Cranks 11/23/1927 PRR RS

S-375 A Drawbridge Locking for Lift Draw 11/28/1927 PRR RS

S-431 A Arrangement of decking, railing and conduit on signal cantilevers 12/15/1927 PRR RS

S-531 E Instrument Case 1/10/1928 PRR RS

S-530 E Instrument Case 1/10/1928 PRR PM

S-532 E Instrument Cases 1/10/1928 PRR RS

S-101 B Cranks and Stand, Two Way Horizontal 1/19/1928 PRR PM

S-100 B Cranks and Stand, One Way Horizontal 1/19/1928 PRR PM

S-125 C Stuffing Box for 1" pipe 2/9/1928 PRR PM

S-331 D Operating rods for single switches 2/16/1928 PRR RS

S-840 _ Draw Bridge Circuits 3/8/1928 PRR RF

S-533 E Instrument Case 3/14/1928 PRR RS

S-534 D Cable Post and Instrument Cases 3/14/1928 PRR RS

S-535 A Instrument Case 3/14/1928 PRR RS

S-463 C Signal, color light highway crossing 3/22/1928 PRR RS

S-888 _ Coded Crcuits Superimposed on D.C.Track Circuits 4/26/1928 PRR RF

S-429 C Parts for Decking, Railing and Conduit for signal bridges and cantilevers 5/11/1928 PRR RS

S-432 A Arrangement of decking, railing and conduit on signal bridges 5/22/1928 PRR RS

S-433 A Arrangement of Decking Railing and Conduit on Signal Bridges 5/22/1928 PRR PM

S-142 B Pipe Carrier Supports 5/28/1928 PRR RS

S-401 D Position Light Signal Parts 6/15/1928 PRR RS

S-522 C Blocking Devices for Interlocking Machine Levers 7/6/1928 PRR PM

S-812 _ Control Circuits for D.C. Slow Acting Relays 8/3/1928 PRR RF

S-179 H Rail Bonds and clips (Sheet 1/1) 2/1/1929 PRR RS

SK-184 A Trade Circuit Connector- Parkway Cable 2/8/1929 PRR RS

S-470 A Distant switch indicator 2/25/1929 PRR PM

S-486 C Cover Glasses and Lenses for Position and other Light Signals 2/27/1929 PRR PM

S-311 F Lock Rods 3/20/1929 PRR PM

S-321 F Front lock rods 3/23/1929 PRR RS

S-305 F Front and lock rods for single switches 3/30/1929 PRR RS

S-331 E Operating rods for single switches 3/30/1929 PRR RS

S-532 F Instrument Cases 4/16/1929 PRR RS

S-809 _ Track Circuit Polarity 4/30/1929 PRR RF

S-216 B Layout, Single Switch, Style "M-2" & "M-20" Mechanisms 5/7/1929 PRR PM

S-186 C Trunking and Capping 9/6/1929 PRRS RS

SK-184 B Trade Circuit Connector- Parkway Cable 9/16/1929 PRR RS

S-824 _ Segments 12/14/1929 PRR RF

S-140 C Pipe Carriers 5/22/1930 PRR PM

S-138 D Pipe Carrier Parts 5/22/1930 PRR PM

S-463 D Signal, Highway Crossing 4/8/1931 PRR PM

S-820 _ Circuits for Lever Repeating Relays 5/12/1931 PRR RF

S-845 _ Circuits for Absolute Permissive Block Signal System 8/10/1931 PRR RF

S-826 _ Circuits for Remote Control of Outlaying Switch 5/23/1932 PRR RF

S-371 A Drawbridge Locking for Center Pivot Draw 5/23/1932 PRR PM

S-851 _ Home Signal Control Circuits Between Machine and Signals 8/10/1932 PRR RF

S-857 _ Circuits for Position Light Automatic Signals 10/10/1932 PRR RF

S-305 G Front and Lock Rods for Single Switches 10/11/1932 PRR PM

S-231 C Arrangement for Locking Non-Interlocked Crossover Protected by Signal 12/30/1932 PRR PM

S-229 C Arrangement for Locking Non-Interlocked Crossover 12/30/1932 PRR PM

S-230 C Arrangement for Locking Non-Interlocked Crossover Protected by Signal 12/30/1932 PRR PM

S-530 F Instrument Case 1/23/1933 PRR PM

S-853 _ Control Circuits for Clear Control of Distant Signals 2/21/1933 PRR RF

S-856 _ Lighting Circuits for Position Light Distant Signals 3/12/1933 PRR RF

S-466 A Signs, Details of Reflector Signs for Highway Crossings 10/31/1933 PRR PM

S-465 B Signs, Illuminated and Reflecting for Highway Crossings 10/31/1933 PRR PM

S-467 A Specifications for Reflector Signs and Reflector Units 10/31/1933 PRR PM

S-827 _ Control Circuits for Remote Control of Manual Block Signal 12/21/1933 PRR RF

S-486 D Cover Glasses and Lenses for Position and other Light Signals 2/5/1934 PRR PM

S-410 D Signals, Position Light 2/13/1934 PRR PM

S-532 G Instrument Cases 7/6/1934 PRR PM

S-115 C Foundations, Pipe Carriers and Instrument Cases 7/11/1934 PRR PM

S-116 D Foundations for Compensators and Cranks 7/11/1934 PRR PM

S-497 E Foundations, for Position Light Signals and Instrument Cases 7/20/1934 PRR PM

S-210 F Layout, Single Switch, Type "A-5" Mechanism 7/20/1934 PRR PM

S-522 F Blocking Devices for Interlocking Machine Levers 1/10/1935 PRR PM

S-325 C Front Rod Parts for Movable Point Switches 2/20/1935 PRR PM

S-309 C Front and Lock Rods for Movable Point Frogs 100 LB. P.S. and 130 LB. P.S. Rail 3/23/1935 PRR PM

S-310 A Front and Lock Rods for Movable Point Frogs 131 LB. R.E. and 152 LB. P.S. Rail 3/30/1935 PRR PM

S-375 B Drawbridge Locking for Lift Draw 5/6/1935 PRR PM

S-897 _ Coded Track Circuits Approaching Home Interlocking Signal - Universal Code 6/30/1935 PRR RF

S-324 A Front Rod Parts for Slip Switches 131LB. R.E. and 152LB. P.S. Rail 7/10/1935 PRR PM

S-521 A Switch Wedges 7/10/1935 PRR PM

S-545 F Markers for Switches and Signals 7/31/1935 PRR PM

S-307 A Front and Lock Rods for Slip Switches 131 LB. R.E. and 152 LB. P.S. Rail 8/12/1935 PRR PM

S-308 B Front and Lock Rods for Slip Switches 100 LB. P.S. and 130 LB. P.S. Rail 8/17/1935 PRR PM

S-323 H Front Rod Parts for Slip Switches 100LB. P.S. and 130 LB. P.S. Rail 8/27/1935 PRR PM

S-221 C Switch Circuit Controller 9/17/1935 PRR PM

S-835 _ Circuits for Automatic Gauntlet Signals 10/1/1935 PRR RF

S-859 _ Circuits for Interlocking Operated Part Time 11/30/1935 PRR RF

S-841 _ Control Circuits for Torpedo Placing Machine 1/28/1936 PRR RF

S-321 H Front Rod Parts 3/6/1936 PRR PM

S-510 B Battery Box 6/10/1936 PRR PM

S-509 B Battery Well 6/12/1936 PS PM

S-380 A Smashboards 7/23/1936 PRR PM

S-884 _ Coded Track Circuits in Automatic Territory 9/2/1936 PRR RF

S-823 _ Circuits for Electric Switches 3/1/1937 PRR RF

S-894 _ Coded Track Circuits in Automatic Territory - Universal Code 3/6/1937 PRR RF

S-893 _ Coded Track Circuits Approaching Distant Interlocking Signals - Universal Code 3/6/1937 PRR RF

S-811 _ 110 Volt A.C. Power Supply for Interlockings 3/22/1937 PRR RF

S-819 _ Trap Circuits 3/23/1937 PRR RF

S-865 _ Approach Lighting Circuits 5/11/1937 PRR RF

S-482 C Lamp Details for Oil Lighted Switch and Signal Lamps 6/23/1937 PRR PM

S-817 _ Method of Measuring Resistance of Made Ground 7/17/1937 PRR RF

S-487 E Roundels & Lenses 7/24/1937 PRR PM

S-555 D Atmospheric Aftercooler and Drip Feed 9/15/1937 PRR PM

S-179 K Rail Bonds and Connectors (Sheet 2/2) 11/4/1937 PRR PM

S-333 C Operating Rods for Double Slip Switches 12/6/1937 PRR PM

S-335 C Operating Rods for M.P. Frogs 12/6/1937 PRR PM

S-818 _ Track Insulation Tests 1/12/1938 PRR RF

S-540 C Instrument Racks for Interlocking Stations 1/13/1938 PRR PM

S-176 B Layout for Type AZ Impedance Bonds 5/31/1938 PRR PM

S-241 F Dragging Equipment Detector 3/4/1939 PRR PM

S-401 E Position Light Signal Parts 3/29/1939 PRR PM

S-513 F Terminal Blocks 5/14/1940 PRR PM

S-124 A Pipe Line Insulation, One Inch Signal Pipe 5/20/1940 PRR PM

S-118 B Screw and Solid Jaws 5/20/1940 PRR PM

S-176 C Layout for Type AZ Impedance Bonds 4/25/1942 PRR PM

S-241 J Dragging Equipment Detector 6/5/1942 PRR PM

S-545 G Markers for Grade Signal and Spring Switch 7/8/1942 PRR PM

S-177 B Layout for Type AZ Impedance Bonds (for Trial Installations) 8/10/1942 PRR PM

S-180 C Rail Bond, Rail Head Type 8/25/1942 PRR PM

S-872 _ Control Circuits for Electric Switch Locks on Non-Interlocked Switches 11/3/1942 PRR RF

S-490 B Numerals & Letters, Cast Iron, for Signal Numbering 11/27/1942 PRR PM

S-114 D Foundations, Air Line 4/24/1943 PRR PM

S-496 C Foundations, Precast Concrete, for Position Light Signals 4/29/1943 PRR PM

S-464 C Block-Limit Signal and Approach Block-Limit Sign 6/18/1943 PRR PM

S-881 _ Coded Track Circuits for Interlockings 7/31/1943 PRR RF

S-887 _ Coded Track Citcuits Approaching Home Interlocking Signal 1/17/1944 PRR RF

S-489 G Numerals and Letters, Enameled, for Signal Numbering 1/23/1944 PRR PM

S-866 _ Lighting Circuits for Lamps on Crossing Gates 4/10/1944 PRR RF

S-854 _ Typical Control Circuits for Block Signals 4/22/1944 PRR RF

S-496 D Foundations, Precast Concrete, for Position Light Signals 6/26/1944 PRR PM

S-468 B Markers 8/25/1944 PRR PM

S-311 G Lock Rods 5/10/1945 PRR PM

S-807 _ Protection of Oil Sidings from Electric Sparks 6/22/1945 PRR RF

S-483 E Incandescent Electric Lamps 12/4/1945 PRR PM

S-530 H Instrument Cases 3/4/1946 PRR PM

S-331 I Operating Rods for Single Switches 9/5/1946 PRR PM

S-222 A Layout, 45 ft. Split Switch, Electo-Pneumatic or Mechanical Operation 9/30/1946 PRR PM

S-237 C Lever and Stand 10/25/1946 PRR PM

S-179 L Rail Bonds and Connectors (Sheet 1/2) 11/12/1946 PRR PM

S-873 _ Circuits for Check Locking Between Adjacent Interlocking Stations with Panel Type Blocking Device 1/24/1947 PRR RF

S-178 A Rail Bond Clips 2/17/1947 PRR PM

S-111 B Foundations, Angle Iron for Instrument Cases 2/24/1947 PRR PM

S-110 B Foundation, Cast Iron for Instrument Cases 4/10/1947 PRR PM

S-601 A Symbols 4/12/1947 PRR RF

S-801 _ Track Circuit Designations 4/15/1947 PRR RF

S-490 C Numerals and Letters, Enameled, for Signal Numbering 4/25/1947 PRR PM

S-109 A Foundation, Precast Concrete for Instrument Cases 4/30/1947 PRR PM

S-813 _ Lightning Protection for Signal Circuits in Steam Territory 8/7/1947 PRR RF

S-241 K Dragging Equipment Detector, Parts and Details 8/20/1947 PRR PM

S-462 A Layout for Automatic Highway Crossing Gates 9/30/1947 PRR PM

S-195 A Switch Ties for Interlocking Single Switches 12/4/1947 PRR PM

S-546 C Cable Marker for Underground Cables 4/14/1948 PRR PM

S-464 G Block-Limit Signal and Approach Block-Limit Signal 4/23/1948 PRR PM

S-538 E Instrument Houses, Steel Insulated 4/28/1948 PRR PM

S-810 _ Ground Detector Wiring Diagram 5/8/1948 PRR RF

S-195 B Switch Ties for Interlocking Single Switches 5/26/1948 PRR PM

S-498 A Foundations, Precast Concrete 9/14/1948 PRR PM

S-844 _ Circuits for Automatic Interlocking at Railroad Grade Crossings 11/4/1948 PRR RF

S-179 M Rail Bonds and Connectors 12/28/1948 PRR PM

S-803 _ Bonding and Insulation of Switches 12/29/1948 PRR RF

S-372 D Drawbridge Locking for Center Pivot Draw 12/30/1948 PRR PM

S-121 B Jaws, Lugs, and Links 12/30/1948 PRR PM

S-224 A Mounting of T-20 H.O. Mechanism and SL-26 Electric Switch Lock 2/21/1949 PRR PM

S-484 D Blades for Semaphore Signals 5/9/1949 PRR PM

S-469 B Signs, Illuminated 8/9/1949 PRR PM

S-472 A Signs, End of Block and Fouling Point 9/27/1949 PRR PM

S-802 _ Designation of Instruments and Apparatus Indicated on Signal Circuit Plans 10/3/1949 PRR RF

S-232 C Locking for Non-Interlocked Turnouts Equipped with Derail 1/25/1950 PRR PM

S-830 _ Control Circuits for Flashing Light Train Order Signal 4/25/1950 PRR RF

S-528 J Eyelets, Tags & Connectors 5/17/1950 PRR PM

S-816 _ Application of Centrifugal Track Relays on Double Rail Track Circuit 5/18/1950 PRR RF

S-889 _ Code Change Point Approaching Home Interlocking Sig's. 5/18/1950 PRR RF

S-822 _ Circuits for Electro-Pneumatic Switches 5/24/1950 PRR RF

S-602 N Signal Aspects 8/30/1950 PRR RF

S-250 A Electric Switch Heaters, Active Element 24 feet or less in Length, A.C. Operation 12/19/1950 PRR PM

S-111 C Foundations, Angle Iron for Instrument Cases 4/9/1951 PRR PM

S-109 B Foundation, Precast Concrete for Instrument Cases 4/10/1951 PRR PM

S-110 C Foundation, Cast Iron for Instrument Cases 4/11/1951 PRR PM

S-121 C Jaws, Lugs, and Links 4/17/1951 PRR PM

S-108 A Platforms for Instrument Cases 6/7/1951 PRR PM

S-184 J Track Circuit Connections, Parkway Cable 12/27/1951 PRR PM

S-400 F Position Light Signal 2/12/1952 PRR PM

S-401 F Position Light Signal Parts 2/12/1952 PRR PM

S-463 E Signal, Flashing Light Highway Crossing 2/26/1952 PRR PM

S-805 _ Arrangement for Lighting Position Light Signals when Normal Power Fails 7/14/1952 PRR RF

S-831 _ Circuits for Color Light Scale Signals, Flag Station Signal & Distant Switch Indicator 7/14/1952 PRR RF

S-860 _ Circuits for Automatic Highway Crossing Signals and Gates 7/14/1952 PRR RF

S-529 A Tags, Printed Plastic 7/31/1952 PRR PM

S-528 K Eyelets, Tags & Connectors 7/31/1952 PRR PM

S-852 _ SS Protection 2/25/1953 PRR RF

S-861 _ Control Circuits for Track Indicating Relays 2/25/1953 PRR RF

S-498 B Foundations, Precast Concrete 3/9/1953 PRR PM

S-400 G Position Light Signals 6/18/1953 PRR PM

S-870 _ Time Locking and Approach Locking Circuits 8/27/1953 PRR RF

S-862 _ Control Circuits for Interlocking Signals 8/27/1953 PRR RF

SK-862 A Control Circuits for Interlocking Signals 5/6/1954 PRR RF

S-814 _ Protection of Fueling Locations from Electric Sparks 3/12/1958 PRR RF

S-855 _ Lighting Circuits for Position Light Home Interlocking and Block Signals 1/12/1959 PRR RF

S-858 _ Arrangement of Terminals in Terminal Box of Position Light Signals 1/26/1959 PRR RF

S-804 _ D.C. Neutral Track Circuits USing Style DN-22BH Relays 2/9/1959 PRR RF

S-879 _ Circuits for Dragging Equipment Detectors 6/10/1959 PRR RF

S-883 _ Coded Track Circuits Approaching Distant Interlocking Signals 3/26/2027 PRR RF

C of = Collection of. PM = Pat McKinney, RF = Robert Fredland, RS = Rob Schoenberg (me!)