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 to download it.

Sorted ascending by Revision

Plan #RevisionTitleRev dateRailroadC of

S-117neededInstrument Case1/1/1900--

S-427neededSignal Supports for Catenary Poles1/1/1900--


S-800neededDimensions of Signal Circuit Plans1/1/1900--

S-425neededSignal Supports for Bridge1/1/1900--
1-S-Foundations and Formers for Compensators, Pipe-Carriers, Cranks and Wheels 1/15/19041/15/1904PRRRS
2-S-Diagrams showing standard methods of signaling at interlockings10/28/1903PRRRS
3-S-Lead out Shafts, Bearings & Up & Down Rods for S. & F. Interlocking Machine 3/30/19059/11/1907PRRRS
225-S1-Mechanical switch layout- application to single switch 5/9/1917PRRRS
6-S-Two Arm Iron Mechanical and Pneumatic Bridge Semaphore Signal.10/27/1904PRRRS
7-S-General Arrangement of Route Signal for Ground Post10/3/1903PRRRS
8-S-One Arm Iron Post Mechanical and Pneumatic Semaphore Signal10/11/1903PRRRS
9-S-Standard Four Arm Electro pneumatic Bracket Post10/27/1904PRRRS
10-S-Distant Switch Signal Layout Operated by No. 11 Switch & Lock Movement1/25/1905PRRRS
305-S2-Mechanism for operating mechanical distant switch signal4/11/1917PRRRS
309-S1-Decking and Hand Railings for Signal Bridges5/29/1919PRRRS
SK-1082-Approach Sign indicating Railroad Ahead7/21/1919PRRRS
227-S1-plungers & base plates- for mechanically operated switches 4/25/1919PRRRS
278-S1-Sign for unattended block station3/25/1919PRRRS
311-S1-Foundations for Ground Signal Masts4/7/1916PRRRS
312-S1-Position light signal units and masts [old style 4 light]1/5/1920PRRRS
275-S1-Four hole insulating rail joint type "B"-for 100 lbs., 125 lbs. and 130 lbs. P. S. rails3/11/1918PRRRS
274-S1-Four hole "Continuous" insulating rail joint-for 125 lbs. and 130 lbs. P.S. rails9/24/1917PRRRS
272-S2-Suspended signal details7/19/1915PRRRS
272-S1-Suspended signal4/11/1917PRRRS
271-S1-Mechanical dwarf signal6/17/1915PRRRS
269-S1-Multiple unit bolt lock3/28/1916PRRRS
228-S1-Mechanical switch layout application to two Single switches 5 ft. to 10 ft. between points 8/26/1917PRRRS
228-S2-Mechanical switch layout application to two single switches 9/18/1917PRRRS
230-S2-Flag station and permissive Signal lamp 2/11/1918PRRRS
EMW150 -Specifications for Installation of Automatic Signals and Electric Circuits 1/12/1909PRRRS
268-S1-Vertical deflecting stand5/12/1915PRRRS
EMW50 -Specifications for Rubber Insulated Signal Wires and Cables 5/1/1910PRRRS
231-S1-Mechanical switch layout- application to Single slips and M. P. frogs 1/22/1919PRRRS
266-S2-Details of battery chutes1/8/1917PRRRS
265-S2-Four hole "Troy" insulating rail joint-for 100 lbs., 125 lbs. and 130 lbs. P. S. rails9/28/1917PRRRS
265-S1-Insulating Rail Joint-Type "W. D. A." for 100 lbs., 125 lbs. & 130 lbs. Rails5/15/1916PRRRS
215-S2-Switch operating Rods 3/18/1919PRRRS
216-S2-Plan of Manard Rail plugged for signal bonding (drilled as per plan 61200 7/27/1915PRRRS
232-S1-Mechanical switch layout- application to Single slips and M. P. frogs 2/27/1919PRRRS
233-S1-Mechanical switch layout- application to M. P. frogs 1/28/1918PRRRS
237-S1-Tie straps 3/22/1917PRRRS
218-S5-Six hole insulating Rail Joint type W1 for 85 lb. P.S. Rails 1/14/1917PRRRS
218-S6-Six hole insulating Rail Joint type W1 for 85 lb. P.S. Rails 2/14/1917PRRRS
218-S7-Six hole insulating Rail Joint type W1 for 85 lb. P. R. R.. Rails 2/15/1917PRRRS
218-S8-Four hole insulating Rail Joint type W1 for 85 lb. P.S. Rails 3/1/1918PRRRS
221-S1-Trunking and conduit 6/5/1918PRRRS
224-S1-Mechanical switch layout- application to single switch 3/7/1917PRRRS
224-S2-Mechanical switch layout- application to single switch 3/26/1917PRRRS
279-S1-Flag station light signal2/6/1920PRRRS
300-S1-Power operated manual block signal6/28/1918PRRRS
300-S2-Automatic block signal6/28/1918PRRRS
300-S3-Automatic block signal6/28/1918PRRRS
300-S4-Power operated interlocked signal6/28/1918PRRRS
300-S6-Power operated distant signal6/28/1918PRRRS
300-S7-Power operated distant signal6/28/1918PRRRS
301-S7-Details of signal masts and parts4/14/1915PRRRS
301-S8-Permissive signal spectacles9/17/1918PRRRS
303-S1-Bracket post12/29/1915PRRRS
305-S1-Layout of facing point switch controlling mechanical distant switch4/11/1917PRRRS
226-S10Mechanical switch layout- application to two single switches 7/10/1917PRRRS
200-S20Mechanical Interlocking Machine 8/17/1909PRRRS
200-S30Mechanical Interlocking Machine 8/17/1909PRRRS
250-S104 lb. Gravity battery zinc 8/30/1910PRRRS
243-S30Mechanical switch layout- application of type "G" S. & L. movement 3/18/1919PRRRS
300-S50Three arm power operated interlocked signal5/10/1915PRRRS
241-S50Position light signal aspects [old style 4 bulb]2/14/1916PRRRS
257-S20Method of Locking Hand Operated Switch1/28/1913PRRRS
301-S50Details of signal masts and parts6/22/1915PRRRS
207-S40Deflector bar Driving Piece 1/5/1910PRRRS
227-S20Plunger lock for mechanically operated Switches 1/5/1910PRRRS
301-S60Details of signal masts and parts4/14/1915PRRRS
200-S40Mechanical Interlocking Machine 8/17/1909PRRRS
200-S11Mechanical Interlocking Machine 8/21/1917PRRRS
310-S11Arrangement of mechanical ground slots4/12/1917PRRRS
207-S31Mechanically operated deflector Bar 1/3/1910PRRRS
208-S51Four hole insulating Rail Joint, Type "k" for P.S. Rail Section (drilled 4,5 & 6 in. per plan 59464 & 59468 6/29/1909PRRRS
208-S61Four hole insulating Rail Joint, Type "k" for P.S. Rail Section (drilled 5, 4-1/2 & 6 in. per plan 59472 & 59476) 6/29/1909PRRRS
208-S71Four hole insulating Rail Joint, Type "k" for P.S. Rail Section (drilled 5-1/2 & 7-1/4 & 6 in. per plan 59480) 6/29/1909PRRRS
210-S31Details of front & Lock Rods 9/14/1909PRRRS
301-S21Details of signal masts and parts5/10/1915PRRRS
301-S41Details of signal masts and parts5/10/1915PRRRS
217-S11Gauge of distance between magnet Core & armature of electro- pneumatic switch and signal magnets 7/29/1909PRRRS
218-S11Six hole insulating Rail Joint type "W" for P. R.. R. Rail Section 2/13/1914PRRRS
218-S41Six hole insulating Rail Joint type "W" for P.S. Rail Section (drilled 5- 1/2 &7-1/4 in. per plan 59480 & 59854) 2/20/1914PRRRS
223-S11Standard Arrangement for Locking Shear-Pole Drawbridges with Signals and Smashboards Operated from Draw3/20/1919PRRRS
241-S31Aspects of signals outside automatic signal limits 2/24/1914PRRRS
304-S11One Arm Power Interlocked Signal7/5/1917PRRRS
304-S21Two Arm Power Interlocked Signal7/5/1917PRRRS
304-S31One Arm Power Operated Automatic Block Signal7/5/1917PRRRS
304-S41Two Arm Power Operated Automatic Block Signal7/5/1917PRRRS
304-S51One Arm Power Operated Distant Signal5/10/1915PRRRS
304-S61Two Arm Power Operated Distant Signal5/10/1915PRRRS
304-S71One Arm Power Operated Interlocking Signal5/10/1915PRRRS
241-S41Aspects of signals within automatic signal limits 2/24/1914PRRRS
242-S11Flange Union10/13/1910PRRRS
246-S11Stop Board1/31/1912PRRRS
263-S216 hole one end insulated rail joint type "w" for P.S. rail section- (drilled 4, 5 &6in. per plans 59464 & 59468) 1/31/1913PRRRS
263-S316 hole one end insulated rail joint type "w" for P.S. rail section- (drilled 5, 4-1/2 &6in. per plans 59472 & 59476) 1/31/1913PRRRS
266-S11Battery Chutes2/26/1918PRRRS
3-S1Rocker Shafts, Bearings and Up & Down Rods1/9/1908PRRRS
254-S12Arrangement of non-interlocked crossover protected by switch target- details 6/7/1917PRRRS
218-S22Six hole insulating Rail Joint type "W" for P.S. Rail Section (drilled 4,5&6 in. per plan 59464 & 59468) 2/13/1914PRRRS
310-S22Arrangement of mechanical ground slots4/11/1917PRRRS
244-S12Flag station signal 2/6/1920PRRRS
301-S32Details of signal masts and parts7/1/1918PRRRS
248-S12Fibre Tags for wire numbering 11/13/1919PRRRS
263-S424 hole one end insulated rail joint type "w" for P.S. rail section 1/30/1913PRRRS
210-S62Details of front & Lock Rods 11/10/1917PRRRS
210-S52Details of front & Lock Rods 10/26/1917PRRRS
223-S2Standard Arrangement for Locking Shear-Pole Drawbridges with Signals and Smashboards Operated from Draw3/20/1919PRRRS
301-S92Details of signal masts and parts12/28/1918PRRRS
249-S12Caustic soda primary battery 1/5/1914PRRRS
218-S32Six hole insulating Rail Joint type "W" for P.S. Rail Section (drilled 5,4-1/2&6 in. per plan 59472 & 59476) 2/13/1914PRRRS
208-S42Four hole insulating Rail Joint, Type "k" for P. R.. R. Rail Section 9/28/1913PRRRS
208-S32Six hole insulating Rail Joint, Type "k" for P.S. Rail Section (drilled 5, 4-1/2 & 6 in. per plan 59472 & 59476) 10/7/1914PRRRS
208-S22Six hole insulating Rail Joint, Type "k" for P.S. Rail Section (drilled 4,5 & 6 in. per plan 59464 & 59468 9/28/1914PRRRS
208-S12Six hole insulating Rail Joint, Type "k" for P. R.. R. Rail Section 9/28/1914PRRRS
207-S12Rail Clips for 3/8" Mechanically operated detector bars, P. R. R. Rail Section 2/14/1910PRRRS
304-S12Power operated manual block signal7/30/1918PRRRS
304-S22Power operated interlocked signal7/30/1918PRRRS
304-S32Power operated automatic block signal7/30/1918PRRRS
304-S42Power operated automatic block signal7/30/1918PRRRS
304-S52Power operated distant signal7/30/1918PRRRS
304-S62Power operated distant signal7/30/1918PRRRS
301-S13Details of signal masts and parts5/10/1915PRRRS
244-S23Flag station signal 2/6/1920PRRRS
210-S43Front & Lock Rods 2/19/1920PRRRS
210-S13Front and Lock Rods 9/28/1918PRRRS
207-S23Rail Clips for 3/8" Mechanically operated detector bars P.S. Rail Section 2/14/1910PRRRS
253-S14Arrangement of non-interlocked crossover protected by switch target 4/13/1917PRRRS
253-S24Arrangement of non-interlocked crossover protected by switch target 4/13/1917PRRRS
253-S35Arrangement of non-interlocked crossover protected by switch target 4/13/1917PRRRS
S-206ALayouts for Derails, Type "G" Mechanism5/31/1922PSPM
S-203ALayout, M.P. Frogs Type "G" Mechanism5/12/1924PRRSPM
S-265ADuplex switch lock 8/2/1920PSPM
S-260ASwitch Mechanism, Hand Operated10/26/1926PRRPM
S-107ACrank and Stands, One and Two Way Vertical6/8/1920PSPM
S-108APlatforms for Instrument Cases6/7/1951PRRPM
S-109AFoundation, Precast Concrete for Instrument Cases4/30/1947PRRPM
S-250AElectric Switch Heaters, Active Element 24 feet or less in Length, A.C. Operation12/19/1950PRRPM
S-178ARail Bond Clips2/17/1947PRRPM
S-118AJaw Parts 6/4/1920PSRS
S-121AJaws and Lugs 8/2/1920PSRS
S-122APipe adjusting Screw 8/4/1920PSPM
S-124APipe Line Insulation, One Inch Signal Pipe5/20/1940PRRPM
S-131AExpansion Joint Parts 6/30/1921PSRS
S-256APlunger Lock12/14/1921PSPM
S-195ASwitch Ties for Interlocking Single Switches12/4/1947PRRPM
S-139APipe Carrier Parts 5/24/1920PSPM
S-255APlunger Lock and Circuit Controller2/11/1922PSPM
S-153ABearings and parts- Rocker Shaft 9/2/1921PSPM
S-154ARocker Shaft and arms 9/2/1921PSPM
S-160ADeflecting Bars and Stand-Horizontal adjustable 6/4/1920PSPM
S-167ALeadout foundation Rocker Shaft 4/29/1921PSPM
S-170ALeadout Foundation parts- for Rocker Shaft Leadout 4/29/1921PSPM
S-212ALayout, Slip Switch,"A1" Mechanism without Cylinder11/22/1927PRRPM
S-213ALayout, M.P. Frogs, Type "A1" Mechanism11/22/1927PRRPM
S-214ALayout, Slip Switch, "A1" Mechanism with Cylinder11/22/1927PRRPM
S-217ALayout, Single Switch, Style "M" Mechanism7/5/1927PRRPM
S-221ASwitch Circuit Controller 3/4/1925PRRSRS
S-222ALayout, 45 ft. Split Switch, Electo-Pneumatic or Mechanical Operation9/30/1946PRRPM
S-224AMounting of T-20 H.O. Mechanism and SL-26 Electric Switch Lock2/21/1949PRRPM
S-228AArrangement for Locking Non-Interlocked Crossover Protected by Signal 2/20/1922PSRS
S-234AArrangement for Locking Non-Interlocked Crossover Protected by Signal9/11/1924PRRSPM
S-235AArrangement for Locking Non-Interlocked Crossover Protected by Signal9/11/1924PRRSPM
S-310AFront and Lock Rods for Movable Point Frogs 131 LB. R.E. and 152 LB. P.S. Rail3/30/1935PRRPM
S-324AFront Rod Parts for Slip Switches 131LB. R.E. and 152LB. P.S. Rail7/10/1935PRRPM
S-333AOperating rods for double slip switches5/12/1924PRRSRS
S-335AOperating rods for M. P. frogs5/12/1924PRRSRS
S-371ADrawbridge Locking for Center Pivot Draw5/23/1932PRRPM
S-375ADrawbridge Locking for Lift Draw11/28/1927PRRRS
S-405ASignals, Position Light8/31/1925PRRSPM
S-406ASignals, Position Light5/14/1926PRRPM
S-407ALadder and Masts for Position Light Signals12/6/1926PRRPM
S-175AChannel Pins 4/26/1921PSRS
S-431AArrangement of decking, railing and conduit on signal cantilevers12/15/1927PRRRS
S-432AArrangement of decking, railing and conduit on signal bridges5/22/1928PRRRS
S-433AArrangement of Decking Railing and Conduit on Signal Bridges5/22/1928PRRPM
S-452ATake Siding Indicator for Placing on Block Stations11/18/1927PRRPM
S-460ASignal parts, one and two-way flag stations4/8/1921PSRS
S-462ALayout for Automatic Highway Crossing Gates9/30/1947PRRPM
S-466ASigns, Details of Reflector Signs for Highway Crossings10/31/1933PRRPM
S-467ASpecifications for Reflector Signs and Reflector Units10/31/1933PRRPM
S-470ADistant switch indicator2/25/1929PRRPM
S-472ASigns, End of Block and Fouling Point9/27/1949PRRPM
S-473ASignal, Color Light Scale1/5/1921PSPM
S-481AElectric Lamp Parts9/7/1926PRRPM
S-483XAIncandescent Electric Lamps Not shown on Standard Plan S-483 Temporarily Approved for use in Signal Service 4/12/1923PRRRS
S-485ABlade Grip Parts for semaphore signals9/29/1920PSRS
S-490ANumerals and Letters for Signal Numbering5/2/1927PRRPM
S-498AFoundations, Precast Concrete9/14/1948PRRPM
S-503AZinc for gravity battery11/25/1924PRRSRS
S-508ABattery Well3/6/1922PSPM
S-509ABattery well and box9/2/1921PSPM
S-510ABattery boxes3/6/1922PSRS
S-511ABattery boxes6/23/1924PRRSPM
S-521ASwitch Wedges7/10/1935PRRPM
S-524AShields for dwarf signals6/24/1920PSRS
S-529ATags, Printed Plastic7/31/1952PRRPM
S-535AInstrument Case3/14/1928PRRRS
S-537ASectionalizing Case and Foundation6/14/1922PSPM
S-547AMonogram for marking tools, lanterns, tinware etc.3/3/1924PRRSRS
S-548ALocking and Sealing Devices6/20/1927PRRPM
S-550AAnchor and Boxes for Air Line2/7/1923PRRSPM
S-580ATools and Gauge4/27/1923PRRSPM
S-308AFront and Lock Rods7/11/1923PRRSRS
S-307AFront and Lock Rods for Slip Switches 131 LB. R.E. and 152 LB. P.S. Rail8/12/1935PRRPM
SK-184ATrade Circuit Connector- Parkway Cable 2/8/1929PRRRS
SK-862AControl Circuits for Interlocking Signals5/6/1954PRRRF
S-207ALayouts for Derails, Type "A1" Mechanism6/8/1923PRRSPM
S-410BSignal, Position Light Dwarf11/9/1926PRRRS
S-309BFront and Lock Rods for M. P. Frogs4/3/1924PRRSRS
S-202BLayout, Double Slip Switch Type "Q" Mechanism12/3/1926PRRSPM
S-195BSwitch Ties for Interlocking Single Switches5/26/1948PRRPM
S-308BFront and Lock Rods for Slip Switches 100 LB. P.S. and 130 LB. P.S. Rail8/17/1935PRRPM
S-210BLayout, Single Switch Type, "A-1" Mechanism 10/28/1926PRRRS
S-211BLayout, Single Switch,Type "A-1" Mechanism10/28/1926PRRPM
S-454BTrain Order Signals2/18/1924PSPM
S-458BSignals, one and two-way flag station2/23/1927PRRRS
S-459BSignal parts, one and two-way flag stations2/23/1927PRRRS
S-256BPlunger Lock 4/22/1925PSRS
S-118BScrew and Solid Jaws5/20/1940PRRPM
S-464BSign, for unattended block station7/31/1924PSRS
S-465BSigns, Illuminated and Reflecting for Highway Crossings10/31/1933PRRPM
S-100BCranks and Stand, One Way Horizontal1/19/1928PRRPM
S-216BLayout, Single Switch, Style "M-2" & "M-20" Mechanisms5/7/1929PRRPM
S-469BSigns, Illuminated8/9/1949PRRPM
S-121BJaws, Lugs, and Links12/30/1948PRRPM
S-186BTrunking and Capping 3/6/1923PRRSRS
S-109BFoundation, Precast Concrete for Instrument Cases4/10/1951PRRPM
S-477BLamp, Oil Lighted Signal10/12/1923PRRSPM
S-110BFoundation, Cast Iron for Instrument Cases4/10/1947PRRPM
S-482BLamp Details for Oil Lighted Switch and Signal Lamps1/7/1926PRRPM
S-183BTrack Circuit Connection 11/10/1927PRRRS
S-483XBIncandescent Electric Lamps Not shown on Standard Plan S-483 Temporarily Approved for use in Signal Service 7/9/1923PRRRS
S-229BArrangement for Locking Non-Interlocked Crossover Protected by Signal 10/9/1926PRRRS
S-486BCover Glasses and Lenses for Position and other Light Signals3/6/1924PSPM
S-487BRoundels & Lenses, for semaphore signals10/18/1922PSRS
S-230BArrangement for Locking Non-Interlocked Crossover Protected by Signal 11/26/1926PRRRS
S-490BNumerals & Letters, Cast Iron, for Signal Numbering11/27/1942PRRPM
S-231BArrangement for Locking Non-Interlocked Crossover Protected by Signal 11/26/1926PRRRS
S-498BFoundations, Precast Concrete3/9/1953PRRPM
S-500BBattery, caustic soda primary8/31/1927PSRS
S-232BArrangement for Locking Non-Interlocked Turnout Protected by Signal 11/9/1926PRRRS
S-233BArrangement for Locking Non-Interlocked Turnout Protected By Signal10/9/1925PRRPM
S-130BExpansion Joint and Flange Union 8/2/1922PSPM
S-509BBattery Well6/12/1936PSPM
S-176BLayout for Type AZ Impedance Bonds5/31/1938PRRPM
S-510BBattery Box6/10/1936PRRPM
S-136BPipe for Signals and Interlocking10/18/1926PRRPM
S-513BTerminal Blocks10/21/1924PSPM
S-111BFoundations, Angle Iron for Instrument Cases2/24/1947PRRPM
S-522BBlocking Devices for Interlocking Machine Levers9/22/1922PSPM
S-325BFront rod parts for M. P. frogs4/3/1924PRRSRS
S-101BCranks and Stand, Two Way Horizontal1/19/1928PRRPM
S-112BPipe Compensator, One-Way Horizontal2/9/1923PRRPM
S-140BPipe Carriers 11/26/1926PRRRS
S-201BLayout, Single Switch, Type "G" Mechanism10/18/1922PSRS
S-375BDrawbridge Locking for Lift Draw5/6/1935PRRPM
S-142BPipe Carrier Supports 5/28/1928PRRRS
S-555BAtmospheric Aftercooler and Drip Feed6/20/1927PRRPM
S-400BSignals, Position Light5/10/1922PRRRS
S-403BLadder Parts for Position Light Signals2/17/1927PRRPM
S-404BLadders for Position Light Signals2/17/1927PRRPM
S-150BDown Rod for Electro-Mechanical Interlocking Machines 3/15/1926PRRPM
SK-12BLocking and Sealing Device for Electric Lock11/17/1924PRRSPM
S-115BFoundations for Pipe Carriers and Instrument Cases 7/27/1927PRRRS
SK-184BTrade Circuit Connector- Parkway Cable 9/16/1929PRRRS
S-177BLayout for Type AZ Impedance Bonds (for Trial Installations)8/10/1942PRRPM
S-408BInstrument Cases and Bases for Signal Masts9/21/1927PRRPM
S-484CBlades for Semaphore Signals6/2/1924PRRSPM
S-110CFoundation, Cast Iron for Instrument Cases4/11/1951PRRPM
S-111CFoundations, Angle Iron for Instrument Cases4/9/1951PRRPM
S-486CCover Glasses and Lenses for Position and other Light Signals2/27/1929PRRPM
S-115CFoundations, Pipe Carriers and Instrument Cases7/11/1934PRRPM
S-487CRoundels & Lenses, for semaphore signals2/8/1927PRRPM
S-429CParts for Decking, Railing and Conduit for signal bridges and cantilevers5/11/1928PRRRS
S-236CLever and Stand 12/15/1926PRRPM
S-490CNumerals and Letters, Enameled, for Signal Numbering4/25/1947PRRPM
S-496CFoundations, Precast Concrete, for Position Light Signals4/29/1943PRRPM
S-497CFoundations, for Position Light Signals and Instrument Cases1/26/1927PRRPM
S-237CLever and Stand10/25/1946PRRPM
S-116CFoundation for Compensators and Cranks 11/23/1927PRRRS
S-323CFront rod parts for slip switches9/18/1925PRRSRS
S-121CJaws, Lugs, and Links4/17/1951PRRPM
S-457CSignal, Color Light Flag Station2/23/1927PRRSPM
S-125CStuffing Box for 1" pipe 2/9/1928PRRPM
S-325CFront Rod Parts for Movable Point Switches2/20/1935PRRPM
S-138CPipe Carrier Parts 11/26/1926PRRRS
S-333COperating Rods for Double Slip Switches12/6/1937PRRPM
S-463CSignal, color light highway crossing3/22/1928PRRRS
S-221CSwitch Circuit Controller9/17/1935PRRPM
S-464CBlock-Limit Signal and Approach Block-Limit Sign6/18/1943PRRPM
S-335COperating Rods for M.P. Frogs12/6/1937PRRPM
S-522CBlocking Devices for Interlocking Machine Levers7/6/1928PRRPM
S-140CPipe Carriers5/22/1930PRRPM
S-528CEyelets and tags3/14/1927PRRRS
S-176CLayout for Type AZ Impedance Bonds4/25/1942PRRPM
S-531CInstrument Case4/12/1924PSPM
S-180CRail Bond, Rail Head Type8/25/1942PRRPM
S-186CTrunking and Capping 9/6/1929PRRSRS
S-540CInstrument Racks for Interlocking Stations1/13/1938PRRPM
S-546CCable Marker for Underground Cables4/14/1948PRRPM
S-229CArrangement for Locking Non-Interlocked Crossover 12/30/1932PRRPM
S-400CSignals, Position Light6/16/1921PRRRS
S-200CLayout, Single Switch, Type "G" Mechanism2/16/1926PRRPM
S-230CArrangement for Locking Non-Interlocked Crossover Protected by Signal12/30/1932PRRPM
S-478CElectric Lamp for semaphore signals9/7/1926PRRPM
S-480CLamp for Flag Station and Unattended Block Station Signals7/25/1924PRRSPM
S-201CLayout, Single Switch, Type "G" Mechanism4/16/1926PRRPM
S-231CArrangement for Locking Non-Interlocked Crossover Protected by Signal12/30/1932PRRPM
S-482CLamp Details for Oil Lighted Switch and Signal Lamps6/23/1937PRRPM
S-483CIncandescent Electric Lamps11/8/1926PRRPM
S-309CFront and Lock Rods for Movable Point Frogs 100 LB. P.S. and 130 LB. P.S. Rail3/23/1935PRRPM
S-232CLocking for Non-Interlocked Turnouts Equipped with Derail1/25/1950PRRPM
S-534DCable Post and Instrument Cases3/14/1928PRRRS
S-311DLock Rods2/23/1926PRRRS
S-220DSwitch Circuit Controller Connection2/21/1927PRRPM
S-258DSwitch Mechanism, Type "G"12/23/1926PRRPM
S-463DSignal, Highway Crossing4/8/1931PRRPM
S-496DFoundations, Precast Concrete, for Position Light Signals6/26/1944PRRPM
S-372DDrawbridge Locking for Center Pivot Draw12/30/1948PRRPM
S-401DPosition Light Signal Parts6/15/1928PRRRS
S-410DSignals, Position Light2/13/1934PRRPM
S-138DPipe Carrier Parts5/22/1930PRRPM
S-116DFoundations for Compensators and Cranks7/11/1934PRRPM
S-555DAtmospheric Aftercooler and Drip Feed9/15/1937PRRPM
S-484DBlades for Semaphore Signals5/9/1949PRRPM
S-331DOperating rods for single switches2/16/1928PRRRS
S-486DCover Glasses and Lenses for Position and other Light Signals2/5/1934PRRPM
S-114DFoundations, Air Line4/24/1943PRRPM
S-489DNumerals and Letters for signal numbering6/3/1927PRRSRS
S-311ELock Rods7/5/1927PRRRS
S-532EInstrument Cases1/10/1928PRRRS
S-321EFront rod parts8/6/1925PRRRS
S-545EMarker for Grade Signal8/23/1927PRRRS
S-401EPosition Light Signal Parts3/29/1939PRRPM
S-483EIncandescent Electric Lamps12/4/1945PRRPM
S-305EFront and lock rods for single switches6/27/1927PRRRS
S-497EFoundations, for Position Light Signals and Instrument Cases7/20/1934PRRPM
S-531EInstrument Case1/10/1928PRRRS
S-463ESignal, Flashing Light Highway Crossing2/26/1952PRRPM
S-602ESignal Aspects8/19/1925PRRRS
S-538EInstrument Houses, Steel Insulated4/28/1948PRRPM
S-331EOperating rods for single switches3/30/1929PRRRS
S-533EInstrument Case3/14/1928PRRRS
S-530EInstrument Case1/10/1928PRRPM
S-487ERoundels & Lenses7/24/1937PRRPM
S-400ESignals, Position Light11/10/1927PRRPM
S-241FDragging Equipment Detector3/4/1939PRRPM
S-305FFront and lock rods for single switches3/30/1929PRRRS
S-210FLayout, Single Switch, Type "A-5" Mechanism7/20/1934PRRPM
S-400FPosition Light Signal2/12/1952PRRPM
S-513FTerminal Blocks5/14/1940PRRPM
S-401FPosition Light Signal Parts2/12/1952PRRPM
S-522FBlocking Devices for Interlocking Machine Levers1/10/1935PRRPM
S-311FLock Rods3/20/1929PRRPM
S-530FInstrument Case1/23/1933PRRPM
S-532FInstrument Cases4/16/1929PRRRS
S-321FFront lock rods3/23/1929PRRRS
S-182FTrack Circuit Connections 2/16/1927PRRRS
S-545FMarkers for Switches and Signals7/31/1935PRRPM
S-179GRail Bonds and clips (Sheet 1/1)11/7/1927PRRRS
S-311GLock Rods5/10/1945PRRPM
S-532GInstrument Cases7/6/1934PRRPM
S-305GFront and Lock Rods for Single Switches10/11/1932PRRPM
S-464GBlock-Limit Signal and Approach Block-Limit Signal4/23/1948PRRPM
S-400GPosition Light Signals6/18/1953PRRPM
S-489GNumerals and Letters, Enameled, for Signal Numbering1/23/1944PRRPM
S-545GMarkers for Grade Signal and Spring Switch7/8/1942PRRPM
S-321HFront Rod Parts3/6/1936PRRPM
S-179HRail Bonds and clips (Sheet 1/1)2/1/1929PRRRS
S-530HInstrument Cases3/4/1946PRRPM
S-323HFront Rod Parts for Slip Switches 100LB. P.S. and 130 LB. P.S. Rail8/27/1935PRRPM
S-331IOperating Rods for Single Switches9/5/1946PRRPM
S-184JTrack Circuit Connections, Parkway Cable12/27/1951PRRPM
S-528JEyelets, Tags & Connectors5/17/1950PRRPM
S-241JDragging Equipment Detector6/5/1942PRRPM
S-241KDragging Equipment Detector, Parts and Details8/20/1947PRRPM
S-179KRail Bonds and Connectors (Sheet 2/2)11/4/1937PRRPM
S-528KEyelets, Tags & Connectors7/31/1952PRRPM
S-179LRail Bonds and Connectors (Sheet 1/2)11/12/1946PRRPM
S-179MRail Bonds and Connectors12/28/1948PRRPM
S-602NSignal Aspects8/30/1950PRRRS
208-S8_Insulating Rail Joint- Type "k" for 100 lbs., 125lbs. & 130lbs. P.S. Rail 9/1/1918PRRRS
206-S3_Solid and Adjustable Links 3/9/1917PRRRS
206-S2_One Inch pipe line Insulation 2/16/1917PRRRS
206-S1_Jaws, Adjusting Screws and Links 4/26/1917PRRRS
205-S2_Compensation Tables, With Typical Layouts7/10/1917PRRRS
204-S4_Vertical Cranks10/15/1914PRRRS
S-801_Track Circuit Designations4/15/1947PRRRF
S-802_Designation of Instruments and Apparatus Indicated on Signal Circuit Plans10/3/1949PRRRF
S-803_Bonding and Insulation of Switches12/29/1948PRRRF
S-804_D.C. Neutral Track Circuits USing Style DN-22BH Relays2/9/1959PRRRF
S-805_Arrangement for Lighting Position Light Signals when Normal Power Fails7/14/1952PRRRF
S-806_Contact Arrangement of Alternating Current Relays6/7/1926PRRRF
S-807_Protection of Oil Sidings from Electric Sparks6/22/1945PRRRF
S-809_Track Circuit Polarity4/30/1929PRRRF
S-810_Ground Detector Wiring Diagram5/8/1948PRRRF
S-811_110 Volt A.C. Power Supply for Interlockings3/22/1937PRRRF
S-812_Control Circuits for D.C. Slow Acting Relays8/3/1928PRRRF
S-813_Lightning Protection for Signal Circuits in Steam Territory8/7/1947PRRRF
S-814_Protection of Fueling Locations from Electric Sparks3/12/1958PRRRF
S-816_Application of Centrifugal Track Relays on Double Rail Track Circuit5/18/1950PRRRF
S-817_Method of Measuring Resistance of Made Ground7/17/1937PRRRF
S-818_Track Insulation Tests1/12/1938PRRRF
S-819_Trap Circuits3/23/1937PRRRF
S-820_Circuits for Lever Repeating Relays5/12/1931PRRRF
S-821_Circuits for Electro-Mechanical Switches5/7/1924PRRRF
S-822_Circuits for Electro-Pneumatic Switches5/24/1950PRRRF
S-823_Circuits for Electric Switches3/1/1937PRRRF
S-825_Route Locking Circuits9/20/1927PRRRF
S-826_Circuits for Remote Control of Outlaying Switch5/23/1932PRRRF
S-827_Control Circuits for Remote Control of Manual Block Signal12/21/1933PRRRF
S-830_Control Circuits for Flashing Light Train Order Signal4/25/1950PRRRF
S-831_Circuits for Color Light Scale Signals, Flag Station Signal & Distant Switch Indicator7/14/1952PRRRF
S-835_Circuits for Automatic Gauntlet Signals10/1/1935PRRRF
S-840_Draw Bridge Circuits3/8/1928PRRRF
S-841_Control Circuits for Torpedo Placing Machine1/28/1936PRRRF
S-844_Circuits for Automatic Interlocking at Railroad Grade Crossings11/4/1948PRRRF
S-845_Circuits for Absolute Permissive Block Signal System8/10/1931PRRRF
S-847_Control Circuits for 110 V.A.C. "T2" Motor Signals12/14/1926PRRRF
S-851_Home Signal Control Circuits Between Machine and Signals8/10/1932PRRRF
S-852_SS Protection2/25/1953PRRRF
S-853_Control Circuits for Clear Control of Distant Signals2/21/1933PRRRF
S-854_Typical Control Circuits for Block Signals4/22/1944PRRRF
S-855_Lighting Circuits for Position Light Home Interlocking and Block Signals1/12/1959PRRRF
S-856_Lighting Circuits for Position Light Distant Signals3/12/1933PRRRF
S-857_Circuits for Position Light Automatic Signals10/10/1932PRRRF
S-858_Arrangement of Terminals in Terminal Box of Position Light Signals1/26/1959PRRRF
S-859_Circuits for Interlocking Operated Part Time11/30/1935PRRRF
S-860_Circuits for Automatic Highway Crossing Signals and Gates7/14/1952PRRRF
S-861_Control Circuits for Track Indicating Relays2/25/1953PRRRF
S-862_Control Circuits for Interlocking Signals8/27/1953PRRRF
S-863_Local Circuits for Motor Interlocking & Block Signals5/19/1927PRRRF
S-864_Local Circuits for Motor Distant Signals5/19/1927PRRRF
S-865_Approach Lighting Circuits5/11/1937PRRRF
S-866_Lighting Circuits for Lamps on Crossing Gates4/10/1944PRRRF
S-867_Control Circuits for Position Light Dwarf Signals9/30/1927PRRRF
S-870_Time Locking and Approach Locking Circuits8/27/1953PRRRF
S-871_Control Circuits for Controlled Manual Block12/30/1926PRRRF
S-872_Control Circuits for Electric Switch Locks on Non-Interlocked Switches11/3/1942PRRRF
S-873_Circuits for Check Locking Between Adjacent Interlocking Stations with Panel Type Blocking Device1/24/1947PRRRF
S-879_Circuits for Dragging Equipment Detectors6/10/1959PRRRF
S-881_Coded Track Circuits for Interlockings7/31/1943PRRRF
S-883_Coded Track Circuits Approaching Distant Interlocking Signals3/26/2027PRRRF
S-884_Coded Track Circuits in Automatic Territory9/2/1936PRRRF
S-887_Coded Track Citcuits Approaching Home Interlocking Signal1/17/1944PRRRF
S-888_Coded Crcuits Superimposed on D.C.Track Circuits4/26/1928PRRRF
S-889_Code Change Point Approaching Home Interlocking Sig's.5/18/1950PRRRF
S-893_Coded Track Circuits Approaching Distant Interlocking Signals - Universal Code3/6/1937PRRRF
S-894_Coded Track Circuits in Automatic Territory - Universal Code3/6/1937PRRRF
S-897_Coded Track Circuits Approaching Home Interlocking Signal - Universal Code6/30/1935PRRRF
SigPipe_Specifications for One-Inch Signal pipe and Couplings 4/1/1909RS
202-S1_Up and down Rods for mechanical Interlocking Machines 6/6/1917PRRRS
RightLine_Instructions and Specifications for right-line Signal Plans 1/1/1915PRRRS
RevNot2_Revision notice-S-528-C, S-400-C, S-401-B, S-482-A, S-483-B11/20/1923PRRRS
RevNot1_Revision notice-S-179C, S-477-B, S-528-B, 489-B6/17/1924PRRRS
IDX_Index, Standard Signal Material Plans and Specifications10/1/1923PRRRS
210-S2_Front and Lock Rods 9/28/1918PRRRS

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

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