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 Latest revision date

Plan #RevisionTitleRev dateRailroadC of


S-425neededSignal Supports for Bridge1/1/1900--

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

S-117neededInstrument Case1/1/1900--

S-427neededSignal Supports for Catenary Poles1/1/1900--
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
2-S-Diagrams showing standard methods of signaling at interlockings10/28/1903PRRRS
1-S-Foundations and Formers for Compensators, Pipe-Carriers, Cranks and Wheels 1/15/19041/15/1904PRRRS
6-S-Two Arm Iron Mechanical and Pneumatic Bridge Semaphore Signal.10/27/1904PRRRS
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
3-S-Lead out Shafts, Bearings & Up & Down Rods for S. & F. Interlocking Machine 3/30/19059/11/1907PRRRS
3-S1Rocker Shafts, Bearings and Up & Down Rods1/9/1908PRRRS
EMW150 -Specifications for Installation of Automatic Signals and Electric Circuits 1/12/1909PRRRS
SigPipe_Specifications for One-Inch Signal pipe and Couplings 4/1/1909RS
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
217-S11Gauge of distance between magnet Core & armature of electro- pneumatic switch and signal magnets 7/29/1909PRRRS
200-S30Mechanical Interlocking Machine 8/17/1909PRRRS
200-S40Mechanical Interlocking Machine 8/17/1909PRRRS
200-S20Mechanical Interlocking Machine 8/17/1909PRRRS
210-S31Details of front & Lock Rods 9/14/1909PRRRS
207-S31Mechanically operated deflector Bar 1/3/1910PRRRS
207-S40Deflector bar Driving Piece 1/5/1910PRRRS
227-S20Plunger lock for mechanically operated Switches 1/5/1910PRRRS
207-S12Rail Clips for 3/8" Mechanically operated detector bars, P. R. R. Rail Section 2/14/1910PRRRS
207-S23Rail Clips for 3/8" Mechanically operated detector bars P.S. Rail Section 2/14/1910PRRRS
EMW50 -Specifications for Rubber Insulated Signal Wires and Cables 5/1/1910PRRRS
250-S104 lb. Gravity battery zinc 8/30/1910PRRRS
242-S11Flange Union10/13/1910PRRRS
246-S11Stop Board1/31/1912PRRRS
257-S20Method of Locking Hand Operated Switch1/28/1913PRRRS
263-S424 hole one end insulated rail joint type "w" for P.S. rail section 1/30/1913PRRRS
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
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
208-S42Four hole insulating Rail Joint, Type "k" for P. R.. R. Rail Section 9/28/1913PRRRS
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
218-S11Six hole insulating Rail Joint type "W" for P. R.. R. Rail Section 2/13/1914PRRRS
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
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
241-S41Aspects of signals within automatic signal limits 2/24/1914PRRRS
241-S31Aspects of signals outside automatic signal limits 2/24/1914PRRRS
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
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
204-S4_Vertical Cranks10/15/1914PRRRS
RightLine_Instructions and Specifications for right-line Signal Plans 1/1/1915PRRRS
301-S7-Details of signal masts and parts4/14/1915PRRRS
301-S60Details of signal masts and parts4/14/1915PRRRS
301-S41Details of signal masts and parts5/10/1915PRRRS
304-S71One Arm Power Operated Interlocking Signal5/10/1915PRRRS
304-S51One Arm Power Operated Distant Signal5/10/1915PRRRS
301-S13Details of signal masts and parts5/10/1915PRRRS
301-S21Details of signal masts and parts5/10/1915PRRRS
300-S50Three arm power operated interlocked signal5/10/1915PRRRS
304-S61Two Arm Power Operated Distant Signal5/10/1915PRRRS
268-S1-Vertical deflecting stand5/12/1915PRRRS
271-S1-Mechanical dwarf signal6/17/1915PRRRS
301-S50Details of signal masts and parts6/22/1915PRRRS
272-S2-Suspended signal details7/19/1915PRRRS
216-S2-Plan of Manard Rail plugged for signal bonding (drilled as per plan 61200 7/27/1915PRRRS
303-S1-Bracket post12/29/1915PRRRS
241-S50Position light signal aspects [old style 4 bulb]2/14/1916PRRRS
269-S1-Multiple unit bolt lock3/28/1916PRRRS
311-S1-Foundations for Ground Signal Masts4/7/1916PRRRS
265-S1-Insulating Rail Joint-Type "W. D. A." for 100 lbs., 125 lbs. & 130 lbs. Rails5/15/1916PRRRS
266-S2-Details of battery chutes1/8/1917PRRRS
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
206-S2_One Inch pipe line Insulation 2/16/1917PRRRS
224-S1-Mechanical switch layout- application to single switch 3/7/1917PRRRS
206-S3_Solid and Adjustable Links 3/9/1917PRRRS
237-S1-Tie straps 3/22/1917PRRRS
224-S2-Mechanical switch layout- application to single switch 3/26/1917PRRRS
310-S22Arrangement of mechanical ground slots4/11/1917PRRRS
272-S1-Suspended signal4/11/1917PRRRS
305-S2-Mechanism for operating mechanical distant switch signal4/11/1917PRRRS
305-S1-Layout of facing point switch controlling mechanical distant switch4/11/1917PRRRS
310-S11Arrangement of mechanical ground slots4/12/1917PRRRS
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
206-S1_Jaws, Adjusting Screws and Links 4/26/1917PRRRS
225-S1-Mechanical switch layout- application to single switch 5/9/1917PRRRS
202-S1_Up and down Rods for mechanical Interlocking Machines 6/6/1917PRRRS
254-S12Arrangement of non-interlocked crossover protected by switch target- details 6/7/1917PRRRS
304-S31One Arm Power Operated Automatic Block Signal7/5/1917PRRRS
304-S41Two Arm Power Operated Automatic Block Signal7/5/1917PRRRS
304-S11One Arm Power Interlocked Signal7/5/1917PRRRS
304-S21Two Arm Power Interlocked Signal7/5/1917PRRRS
205-S2_Compensation Tables, With Typical Layouts7/10/1917PRRRS
226-S10Mechanical switch layout- application to two single switches 7/10/1917PRRRS
200-S11Mechanical Interlocking Machine 8/21/1917PRRRS
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
274-S1-Four hole "Continuous" insulating rail joint-for 125 lbs. and 130 lbs. P.S. rails9/24/1917PRRRS
265-S2-Four hole "Troy" insulating rail joint-for 100 lbs., 125 lbs. and 130 lbs. P. S. rails9/28/1917PRRRS
210-S52Details of front & Lock Rods 10/26/1917PRRRS
210-S62Details of front & Lock Rods 11/10/1917PRRRS
233-S1-Mechanical switch layout- application to M. P. frogs 1/28/1918PRRRS
230-S2-Flag station and permissive Signal lamp 2/11/1918PRRRS
266-S11Battery Chutes2/26/1918PRRRS
218-S8-Four hole insulating Rail Joint type W1 for 85 lb. P.S. Rails 3/1/1918PRRRS
275-S1-Four hole insulating rail joint type "B"-for 100 lbs., 125 lbs. and 130 lbs. P. S. rails3/11/1918PRRRS
221-S1-Trunking and conduit 6/5/1918PRRRS
300-S7-Power operated distant signal6/28/1918PRRRS
300-S2-Automatic block signal6/28/1918PRRRS
300-S4-Power operated interlocked signal6/28/1918PRRRS
300-S3-Automatic block signal6/28/1918PRRRS
300-S1-Power operated manual block signal6/28/1918PRRRS
300-S6-Power operated distant signal6/28/1918PRRRS
301-S32Details of signal masts and parts7/1/1918PRRRS
304-S22Power operated interlocked signal7/30/1918PRRRS
304-S32Power operated automatic block signal7/30/1918PRRRS
304-S42Power operated automatic block signal7/30/1918PRRRS
304-S62Power operated distant signal7/30/1918PRRRS
304-S52Power operated distant signal7/30/1918PRRRS
304-S12Power operated manual block signal7/30/1918PRRRS
208-S8_Insulating Rail Joint- Type "k" for 100 lbs., 125lbs. & 130lbs. P.S. Rail 9/1/1918PRRRS
301-S8-Permissive signal spectacles9/17/1918PRRRS
210-S13Front and Lock Rods 9/28/1918PRRRS
210-S2_Front and Lock Rods 9/28/1918PRRRS
301-S92Details of signal masts and parts12/28/1918PRRRS
231-S1-Mechanical switch layout- application to Single slips and M. P. frogs 1/22/1919PRRRS
232-S1-Mechanical switch layout- application to Single slips and M. P. frogs 2/27/1919PRRRS
215-S2-Switch operating Rods 3/18/1919PRRRS
243-S30Mechanical switch layout- application of type "G" S. & L. movement 3/18/1919PRRRS
223-S2Standard Arrangement for Locking Shear-Pole Drawbridges with Signals and Smashboards Operated from Draw3/20/1919PRRRS
223-S11Standard Arrangement for Locking Shear-Pole Drawbridges with Signals and Smashboards Operated from Draw3/20/1919PRRRS
278-S1-Sign for unattended block station3/25/1919PRRRS
227-S1-plungers & base plates- for mechanically operated switches 4/25/1919PRRRS
309-S1-Decking and Hand Railings for Signal Bridges5/29/1919PRRRS
SK-1082-Approach Sign indicating Railroad Ahead7/21/1919PRRRS
248-S12Fibre Tags for wire numbering 11/13/1919PRRRS
312-S1-Position light signal units and masts [old style 4 light]1/5/1920PRRRS
279-S1-Flag station light signal2/6/1920PRRRS
244-S23Flag station signal 2/6/1920PRRRS
244-S12Flag station signal 2/6/1920PRRRS
210-S43Front & Lock Rods 2/19/1920PRRRS
S-139APipe Carrier Parts 5/24/1920PSPM
S-160ADeflecting Bars and Stand-Horizontal adjustable 6/4/1920PSPM
S-118AJaw Parts 6/4/1920PSRS
S-107ACrank and Stands, One and Two Way Vertical6/8/1920PSPM
S-524AShields for dwarf signals6/24/1920PSRS
S-265ADuplex switch lock 8/2/1920PSPM
S-121AJaws and Lugs 8/2/1920PSRS
S-122APipe adjusting Screw 8/4/1920PSPM
S-485ABlade Grip Parts for semaphore signals9/29/1920PSRS
S-473ASignal, Color Light Scale1/5/1921PSPM
S-460ASignal parts, one and two-way flag stations4/8/1921PSRS
S-175AChannel Pins 4/26/1921PSRS
S-170ALeadout Foundation parts- for Rocker Shaft Leadout 4/29/1921PSPM
S-167ALeadout foundation Rocker Shaft 4/29/1921PSPM
S-400CSignals, Position Light6/16/1921PRRRS
S-131AExpansion Joint Parts 6/30/1921PSRS
S-153ABearings and parts- Rocker Shaft 9/2/1921PSPM
S-154ARocker Shaft and arms 9/2/1921PSPM
S-509ABattery well and box9/2/1921PSPM
S-256APlunger Lock12/14/1921PSPM
S-255APlunger Lock and Circuit Controller2/11/1922PSPM
S-228AArrangement for Locking Non-Interlocked Crossover Protected by Signal 2/20/1922PSRS
S-510ABattery boxes3/6/1922PSRS
S-508ABattery Well3/6/1922PSPM
S-400BSignals, Position Light5/10/1922PRRRS
S-206ALayouts for Derails, Type "G" Mechanism5/31/1922PSPM
S-537ASectionalizing Case and Foundation6/14/1922PSPM
S-130BExpansion Joint and Flange Union 8/2/1922PSPM
S-522BBlocking Devices for Interlocking Machine Levers9/22/1922PSPM
S-487BRoundels & Lenses, for semaphore signals10/18/1922PSRS
S-201BLayout, Single Switch, Type "G" Mechanism10/18/1922PSRS
S-550AAnchor and Boxes for Air Line2/7/1923PRRSPM
S-112BPipe Compensator, One-Way Horizontal2/9/1923PRRPM
S-186BTrunking and Capping 3/6/1923PRRSRS
S-483XAIncandescent Electric Lamps Not shown on Standard Plan S-483 Temporarily Approved for use in Signal Service 4/12/1923PRRRS
S-580ATools and Gauge4/27/1923PRRSPM
S-207ALayouts for Derails, Type "A1" Mechanism6/8/1923PRRSPM
S-483XBIncandescent Electric Lamps Not shown on Standard Plan S-483 Temporarily Approved for use in Signal Service 7/9/1923PRRRS
S-308AFront and Lock Rods7/11/1923PRRSRS
IDX_Index, Standard Signal Material Plans and Specifications10/1/1923PRRRS
S-477BLamp, Oil Lighted Signal10/12/1923PRRSPM
RevNot2_Revision notice-S-528-C, S-400-C, S-401-B, S-482-A, S-483-B11/20/1923PRRRS
S-454BTrain Order Signals2/18/1924PSPM
S-547AMonogram for marking tools, lanterns, tinware etc.3/3/1924PRRSRS
S-486BCover Glasses and Lenses for Position and other Light Signals3/6/1924PSPM
S-309BFront and Lock Rods for M. P. Frogs4/3/1924PRRSRS
S-325BFront rod parts for M. P. frogs4/3/1924PRRSRS
S-531CInstrument Case4/12/1924PSPM
S-821_Circuits for Electro-Mechanical Switches5/7/1924PRRRF
S-335AOperating rods for M. P. frogs5/12/1924PRRSRS
S-333AOperating rods for double slip switches5/12/1924PRRSRS
S-203ALayout, M.P. Frogs Type "G" Mechanism5/12/1924PRRSPM
S-484CBlades for Semaphore Signals6/2/1924PRRSPM
RevNot1_Revision notice-S-179C, S-477-B, S-528-B, 489-B6/17/1924PRRRS
S-511ABattery boxes6/23/1924PRRSPM
S-480CLamp for Flag Station and Unattended Block Station Signals7/25/1924PRRSPM
S-464BSign, for unattended block station7/31/1924PSRS
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-513BTerminal Blocks10/21/1924PSPM
SK-12BLocking and Sealing Device for Electric Lock11/17/1924PRRSPM
S-503AZinc for gravity battery11/25/1924PRRSRS
S-221ASwitch Circuit Controller 3/4/1925PRRSRS
S-256BPlunger Lock 4/22/1925PSRS
S-321EFront rod parts8/6/1925PRRRS
S-602ESignal Aspects8/19/1925PRRRS
S-405ASignals, Position Light8/31/1925PRRSPM
S-323CFront rod parts for slip switches9/18/1925PRRSRS
S-233BArrangement for Locking Non-Interlocked Turnout Protected By Signal10/9/1925PRRPM
S-482BLamp Details for Oil Lighted Switch and Signal Lamps1/7/1926PRRPM
S-200CLayout, Single Switch, Type "G" Mechanism2/16/1926PRRPM
S-311DLock Rods2/23/1926PRRRS
S-150BDown Rod for Electro-Mechanical Interlocking Machines 3/15/1926PRRPM
S-201CLayout, Single Switch, Type "G" Mechanism4/16/1926PRRPM
S-406ASignals, Position Light5/14/1926PRRPM
S-806_Contact Arrangement of Alternating Current Relays6/7/1926PRRRF
S-478CElectric Lamp for semaphore signals9/7/1926PRRPM
S-481AElectric Lamp Parts9/7/1926PRRPM
S-229BArrangement for Locking Non-Interlocked Crossover Protected by Signal 10/9/1926PRRRS
S-136BPipe for Signals and Interlocking10/18/1926PRRPM
S-260ASwitch Mechanism, Hand Operated10/26/1926PRRPM
S-211BLayout, Single Switch,Type "A-1" Mechanism10/28/1926PRRPM
S-210BLayout, Single Switch Type, "A-1" Mechanism 10/28/1926PRRRS
S-483CIncandescent Electric Lamps11/8/1926PRRPM
S-232BArrangement for Locking Non-Interlocked Turnout Protected by Signal 11/9/1926PRRRS
S-410BSignal, Position Light Dwarf11/9/1926PRRRS
S-138CPipe Carrier Parts 11/26/1926PRRRS
S-231BArrangement for Locking Non-Interlocked Crossover Protected by Signal 11/26/1926PRRRS
S-230BArrangement for Locking Non-Interlocked Crossover Protected by Signal 11/26/1926PRRRS
S-140BPipe Carriers 11/26/1926PRRRS
S-202BLayout, Double Slip Switch Type "Q" Mechanism12/3/1926PRRSPM
S-407ALadder and Masts for Position Light Signals12/6/1926PRRPM
S-847_Control Circuits for 110 V.A.C. "T2" Motor Signals12/14/1926PRRRF
S-236CLever and Stand 12/15/1926PRRPM
S-258DSwitch Mechanism, Type "G"12/23/1926PRRPM
S-871_Control Circuits for Controlled Manual Block12/30/1926PRRRF
S-497CFoundations, for Position Light Signals and Instrument Cases1/26/1927PRRPM
S-487CRoundels & Lenses, for semaphore signals2/8/1927PRRPM
S-182FTrack Circuit Connections 2/16/1927PRRRS
S-404BLadders for Position Light Signals2/17/1927PRRPM
S-403BLadder Parts for Position Light Signals2/17/1927PRRPM
S-220DSwitch Circuit Controller Connection2/21/1927PRRPM
S-459BSignal parts, one and two-way flag stations2/23/1927PRRRS
S-458BSignals, one and two-way flag station2/23/1927PRRRS
S-457CSignal, Color Light Flag Station2/23/1927PRRSPM
S-528CEyelets and tags3/14/1927PRRRS
S-490ANumerals and Letters for Signal Numbering5/2/1927PRRPM
S-864_Local Circuits for Motor Distant Signals5/19/1927PRRRF
S-863_Local Circuits for Motor Interlocking & Block Signals5/19/1927PRRRF
S-489DNumerals and Letters for signal numbering6/3/1927PRRSRS
S-548ALocking and Sealing Devices6/20/1927PRRPM
S-555BAtmospheric Aftercooler and Drip Feed6/20/1927PRRPM
S-305EFront and lock rods for single switches6/27/1927PRRRS
S-311ELock Rods7/5/1927PRRRS
S-217ALayout, Single Switch, Style "M" Mechanism7/5/1927PRRPM
S-115BFoundations for Pipe Carriers and Instrument Cases 7/27/1927PRRRS
S-545EMarker for Grade Signal8/23/1927PRRRS
S-500BBattery, caustic soda primary8/31/1927PSRS
S-825_Route Locking Circuits9/20/1927PRRRF
S-408BInstrument Cases and Bases for Signal Masts9/21/1927PRRPM
S-867_Control Circuits for Position Light Dwarf Signals9/30/1927PRRRF
S-179GRail Bonds and clips (Sheet 1/1)11/7/1927PRRRS
S-400ESignals, Position Light11/10/1927PRRPM
S-183BTrack Circuit Connection 11/10/1927PRRRS
S-452ATake Siding Indicator for Placing on Block Stations11/18/1927PRRPM
S-213ALayout, M.P. Frogs, Type "A1" Mechanism11/22/1927PRRPM
S-214ALayout, Slip Switch, "A1" Mechanism with Cylinder11/22/1927PRRPM
S-212ALayout, Slip Switch,"A1" Mechanism without Cylinder11/22/1927PRRPM
S-116CFoundation for Compensators and Cranks 11/23/1927PRRRS
S-375ADrawbridge Locking for Lift Draw11/28/1927PRRRS
S-431AArrangement of decking, railing and conduit on signal cantilevers12/15/1927PRRRS
S-530EInstrument Case1/10/1928PRRPM
S-531EInstrument Case1/10/1928PRRRS
S-532EInstrument Cases1/10/1928PRRRS
S-100BCranks and Stand, One Way Horizontal1/19/1928PRRPM
S-101BCranks and Stand, Two Way Horizontal1/19/1928PRRPM
S-125CStuffing Box for 1" pipe 2/9/1928PRRPM
S-331DOperating rods for single switches2/16/1928PRRRS
S-840_Draw Bridge Circuits3/8/1928PRRRF
S-533EInstrument Case3/14/1928PRRRS
S-535AInstrument Case3/14/1928PRRRS
S-534DCable Post and Instrument Cases3/14/1928PRRRS
S-463CSignal, color light highway crossing3/22/1928PRRRS
S-888_Coded Crcuits Superimposed on D.C.Track Circuits4/26/1928PRRRF
S-429CParts for Decking, Railing and Conduit for signal bridges and cantilevers5/11/1928PRRRS
S-433AArrangement of Decking Railing and Conduit on Signal Bridges5/22/1928PRRPM
S-432AArrangement of decking, railing and conduit on signal bridges5/22/1928PRRRS
S-142BPipe Carrier Supports 5/28/1928PRRRS
S-401DPosition Light Signal Parts6/15/1928PRRRS
S-522CBlocking Devices for Interlocking Machine Levers7/6/1928PRRPM
S-812_Control Circuits for D.C. Slow Acting Relays8/3/1928PRRRF
S-179HRail Bonds and clips (Sheet 1/1)2/1/1929PRRRS
SK-184ATrade Circuit Connector- Parkway Cable 2/8/1929PRRRS
S-470ADistant switch indicator2/25/1929PRRPM
S-486CCover Glasses and Lenses for Position and other Light Signals2/27/1929PRRPM
S-311FLock Rods3/20/1929PRRPM
S-321FFront lock rods3/23/1929PRRRS
S-331EOperating rods for single switches3/30/1929PRRRS
S-305FFront and lock rods for single switches3/30/1929PRRRS
S-532FInstrument Cases4/16/1929PRRRS
S-809_Track Circuit Polarity4/30/1929PRRRF
S-216BLayout, Single Switch, Style "M-2" & "M-20" Mechanisms5/7/1929PRRPM
S-186CTrunking and Capping 9/6/1929PRRSRS
SK-184BTrade Circuit Connector- Parkway Cable 9/16/1929PRRRS
S-140CPipe Carriers5/22/1930PRRPM
S-138DPipe Carrier Parts5/22/1930PRRPM
S-463DSignal, Highway Crossing4/8/1931PRRPM
S-820_Circuits for Lever Repeating Relays5/12/1931PRRRF
S-845_Circuits for Absolute Permissive Block Signal System8/10/1931PRRRF
S-371ADrawbridge Locking for Center Pivot Draw5/23/1932PRRPM
S-826_Circuits for Remote Control of Outlaying Switch5/23/1932PRRRF
S-851_Home Signal Control Circuits Between Machine and Signals8/10/1932PRRRF
S-857_Circuits for Position Light Automatic Signals10/10/1932PRRRF
S-305GFront and Lock Rods for Single Switches10/11/1932PRRPM
S-230CArrangement for Locking Non-Interlocked Crossover Protected by Signal12/30/1932PRRPM
S-231CArrangement for Locking Non-Interlocked Crossover Protected by Signal12/30/1932PRRPM
S-229CArrangement for Locking Non-Interlocked Crossover 12/30/1932PRRPM
S-530FInstrument Case1/23/1933PRRPM
S-853_Control Circuits for Clear Control of Distant Signals2/21/1933PRRRF
S-856_Lighting Circuits for Position Light Distant Signals3/12/1933PRRRF
S-465BSigns, Illuminated and Reflecting for Highway Crossings10/31/1933PRRPM
S-466ASigns, Details of Reflector Signs for Highway Crossings10/31/1933PRRPM
S-467ASpecifications for Reflector Signs and Reflector Units10/31/1933PRRPM
S-827_Control Circuits for Remote Control of Manual Block Signal12/21/1933PRRRF
S-486DCover Glasses and Lenses for Position and other Light Signals2/5/1934PRRPM
S-410DSignals, Position Light2/13/1934PRRPM
S-532GInstrument Cases7/6/1934PRRPM
S-116DFoundations for Compensators and Cranks7/11/1934PRRPM
S-115CFoundations, Pipe Carriers and Instrument Cases7/11/1934PRRPM
S-497EFoundations, for Position Light Signals and Instrument Cases7/20/1934PRRPM
S-210FLayout, Single Switch, Type "A-5" Mechanism7/20/1934PRRPM
S-522FBlocking Devices for Interlocking Machine Levers1/10/1935PRRPM
S-325CFront Rod Parts for Movable Point Switches2/20/1935PRRPM
S-309CFront and Lock Rods for Movable Point Frogs 100 LB. P.S. and 130 LB. P.S. Rail3/23/1935PRRPM
S-310AFront and Lock Rods for Movable Point Frogs 131 LB. R.E. and 152 LB. P.S. Rail3/30/1935PRRPM
S-375BDrawbridge Locking for Lift Draw5/6/1935PRRPM
S-897_Coded Track Circuits Approaching Home Interlocking Signal - Universal Code6/30/1935PRRRF
S-521ASwitch Wedges7/10/1935PRRPM
S-324AFront Rod Parts for Slip Switches 131LB. R.E. and 152LB. P.S. Rail7/10/1935PRRPM
S-545FMarkers for Switches and Signals7/31/1935PRRPM
S-307AFront and Lock Rods for Slip Switches 131 LB. R.E. and 152 LB. P.S. Rail8/12/1935PRRPM
S-308BFront and Lock Rods for Slip Switches 100 LB. P.S. and 130 LB. P.S. Rail8/17/1935PRRPM
S-323HFront Rod Parts for Slip Switches 100LB. P.S. and 130 LB. P.S. Rail8/27/1935PRRPM
S-221CSwitch Circuit Controller9/17/1935PRRPM
S-835_Circuits for Automatic Gauntlet Signals10/1/1935PRRRF
S-859_Circuits for Interlocking Operated Part Time11/30/1935PRRRF
S-841_Control Circuits for Torpedo Placing Machine1/28/1936PRRRF
S-321HFront Rod Parts3/6/1936PRRPM
S-510BBattery Box6/10/1936PRRPM
S-509BBattery Well6/12/1936PSPM
S-884_Coded Track Circuits in Automatic Territory9/2/1936PRRRF
S-823_Circuits for Electric Switches3/1/1937PRRRF
S-894_Coded Track Circuits in Automatic Territory - Universal Code3/6/1937PRRRF
S-893_Coded Track Circuits Approaching Distant Interlocking Signals - Universal Code3/6/1937PRRRF
S-811_110 Volt A.C. Power Supply for Interlockings3/22/1937PRRRF
S-819_Trap Circuits3/23/1937PRRRF
S-865_Approach Lighting Circuits5/11/1937PRRRF
S-482CLamp Details for Oil Lighted Switch and Signal Lamps6/23/1937PRRPM
S-817_Method of Measuring Resistance of Made Ground7/17/1937PRRRF
S-487ERoundels & Lenses7/24/1937PRRPM
S-555DAtmospheric Aftercooler and Drip Feed9/15/1937PRRPM
S-179KRail Bonds and Connectors (Sheet 2/2)11/4/1937PRRPM
S-335COperating Rods for M.P. Frogs12/6/1937PRRPM
S-333COperating Rods for Double Slip Switches12/6/1937PRRPM
S-818_Track Insulation Tests1/12/1938PRRRF
S-540CInstrument Racks for Interlocking Stations1/13/1938PRRPM
S-176BLayout for Type AZ Impedance Bonds5/31/1938PRRPM
S-241FDragging Equipment Detector3/4/1939PRRPM
S-401EPosition Light Signal Parts3/29/1939PRRPM
S-513FTerminal Blocks5/14/1940PRRPM
S-124APipe Line Insulation, One Inch Signal Pipe5/20/1940PRRPM
S-118BScrew and Solid Jaws5/20/1940PRRPM
S-176CLayout for Type AZ Impedance Bonds4/25/1942PRRPM
S-241JDragging Equipment Detector6/5/1942PRRPM
S-545GMarkers for Grade Signal and Spring Switch7/8/1942PRRPM
S-177BLayout for Type AZ Impedance Bonds (for Trial Installations)8/10/1942PRRPM
S-180CRail Bond, Rail Head Type8/25/1942PRRPM
S-872_Control Circuits for Electric Switch Locks on Non-Interlocked Switches11/3/1942PRRRF
S-490BNumerals & Letters, Cast Iron, for Signal Numbering11/27/1942PRRPM
S-114DFoundations, Air Line4/24/1943PRRPM
S-496CFoundations, Precast Concrete, for Position Light Signals4/29/1943PRRPM
S-464CBlock-Limit Signal and Approach Block-Limit Sign6/18/1943PRRPM
S-881_Coded Track Circuits for Interlockings7/31/1943PRRRF
S-887_Coded Track Citcuits Approaching Home Interlocking Signal1/17/1944PRRRF
S-489GNumerals and Letters, Enameled, for Signal Numbering1/23/1944PRRPM
S-866_Lighting Circuits for Lamps on Crossing Gates4/10/1944PRRRF
S-854_Typical Control Circuits for Block Signals4/22/1944PRRRF
S-496DFoundations, Precast Concrete, for Position Light Signals6/26/1944PRRPM
S-311GLock Rods5/10/1945PRRPM
S-807_Protection of Oil Sidings from Electric Sparks6/22/1945PRRRF
S-483EIncandescent Electric Lamps12/4/1945PRRPM
S-530HInstrument Cases3/4/1946PRRPM
S-331IOperating Rods for Single Switches9/5/1946PRRPM
S-222ALayout, 45 ft. Split Switch, Electo-Pneumatic or Mechanical Operation9/30/1946PRRPM
S-237CLever and Stand10/25/1946PRRPM
S-179LRail Bonds and Connectors (Sheet 1/2)11/12/1946PRRPM
S-873_Circuits for Check Locking Between Adjacent Interlocking Stations with Panel Type Blocking Device1/24/1947PRRRF
S-178ARail Bond Clips2/17/1947PRRPM
S-111BFoundations, Angle Iron for Instrument Cases2/24/1947PRRPM
S-110BFoundation, Cast Iron for Instrument Cases4/10/1947PRRPM
S-801_Track Circuit Designations4/15/1947PRRRF
S-490CNumerals and Letters, Enameled, for Signal Numbering4/25/1947PRRPM
S-109AFoundation, Precast Concrete for Instrument Cases4/30/1947PRRPM
S-813_Lightning Protection for Signal Circuits in Steam Territory8/7/1947PRRRF
S-241KDragging Equipment Detector, Parts and Details8/20/1947PRRPM
S-462ALayout for Automatic Highway Crossing Gates9/30/1947PRRPM
S-195ASwitch Ties for Interlocking Single Switches12/4/1947PRRPM
S-546CCable Marker for Underground Cables4/14/1948PRRPM
S-464GBlock-Limit Signal and Approach Block-Limit Signal4/23/1948PRRPM
S-538EInstrument Houses, Steel Insulated4/28/1948PRRPM
S-810_Ground Detector Wiring Diagram5/8/1948PRRRF
S-195BSwitch Ties for Interlocking Single Switches5/26/1948PRRPM
S-498AFoundations, Precast Concrete9/14/1948PRRPM
S-844_Circuits for Automatic Interlocking at Railroad Grade Crossings11/4/1948PRRRF
S-179MRail Bonds and Connectors12/28/1948PRRPM
S-803_Bonding and Insulation of Switches12/29/1948PRRRF
S-121BJaws, Lugs, and Links12/30/1948PRRPM
S-372DDrawbridge Locking for Center Pivot Draw12/30/1948PRRPM
S-224AMounting of T-20 H.O. Mechanism and SL-26 Electric Switch Lock2/21/1949PRRPM
S-484DBlades for Semaphore Signals5/9/1949PRRPM
S-469BSigns, Illuminated8/9/1949PRRPM
S-472ASigns, End of Block and Fouling Point9/27/1949PRRPM
S-802_Designation of Instruments and Apparatus Indicated on Signal Circuit Plans10/3/1949PRRRF
S-232CLocking for Non-Interlocked Turnouts Equipped with Derail1/25/1950PRRPM
S-830_Control Circuits for Flashing Light Train Order Signal4/25/1950PRRRF
S-528JEyelets, Tags & Connectors5/17/1950PRRPM
S-889_Code Change Point Approaching Home Interlocking Sig's.5/18/1950PRRRF
S-816_Application of Centrifugal Track Relays on Double Rail Track Circuit5/18/1950PRRRF
S-822_Circuits for Electro-Pneumatic Switches5/24/1950PRRRF
S-602NSignal Aspects8/30/1950PRRRS
S-250AElectric Switch Heaters, Active Element 24 feet or less in Length, A.C. Operation12/19/1950PRRPM
S-111CFoundations, Angle Iron for Instrument Cases4/9/1951PRRPM
S-109BFoundation, Precast Concrete for Instrument Cases4/10/1951PRRPM
S-110CFoundation, Cast Iron for Instrument Cases4/11/1951PRRPM
S-121CJaws, Lugs, and Links4/17/1951PRRPM
S-108APlatforms for Instrument Cases6/7/1951PRRPM
S-184JTrack Circuit Connections, Parkway Cable12/27/1951PRRPM
S-401FPosition Light Signal Parts2/12/1952PRRPM
S-400FPosition Light Signal2/12/1952PRRPM
S-463ESignal, Flashing Light Highway Crossing2/26/1952PRRPM
S-805_Arrangement for Lighting Position Light Signals when Normal Power Fails7/14/1952PRRRF
S-831_Circuits for Color Light Scale Signals, Flag Station Signal & Distant Switch Indicator7/14/1952PRRRF
S-860_Circuits for Automatic Highway Crossing Signals and Gates7/14/1952PRRRF
S-528KEyelets, Tags & Connectors7/31/1952PRRPM
S-529ATags, Printed Plastic7/31/1952PRRPM
S-852_SS Protection2/25/1953PRRRF
S-861_Control Circuits for Track Indicating Relays2/25/1953PRRRF
S-498BFoundations, Precast Concrete3/9/1953PRRPM
S-400GPosition Light Signals6/18/1953PRRPM
S-870_Time Locking and Approach Locking Circuits8/27/1953PRRRF
S-862_Control Circuits for Interlocking Signals8/27/1953PRRRF
SK-862AControl Circuits for Interlocking Signals5/6/1954PRRRF
S-814_Protection of Fueling Locations from Electric Sparks3/12/1958PRRRF
S-855_Lighting Circuits for Position Light Home Interlocking and Block Signals1/12/1959PRRRF
S-858_Arrangement of Terminals in Terminal Box of Position Light Signals1/26/1959PRRRF
S-804_D.C. Neutral Track Circuits USing Style DN-22BH Relays2/9/1959PRRRF
S-879_Circuits for Dragging Equipment Detectors6/10/1959PRRRF
S-883_Coded Track Circuits Approaching Distant Interlocking Signals3/26/2027PRRRF

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

Go back to Rob's Pennsy Home Page!
This page has been accessed 1711 times since
©2000 Robert Schoenberg -