Signal Aspects: PRR

Signal Aspects -- PRR

Pennsylvania Railroad


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From PRR Book of Rules for Conducting Transportation, Effective 28 October 1956, as revised. Comments regarding older usage welcome.


Notes

  1. Semaphore signal aspects are not (yet) included as drawings; the astute reader may be able to make out my meaning from the abbreviated versions.
  2. Signals in the 1956 version were black and white drawings; earlier rulebooks contained color drawings. Color is used here for clarity.
  3. The 1956 rules showed only new-style dwarves (curved side on left). However, old-style (curved side on right) dwarves survived into Amtrak and Conrail, and both forms were shown in AMTK, CR, and later NORAC rules.
  4. Signal face shapes

Rule # Aspect(s) Cab Signal
Aspect
Aspect Name

Indication
280 G)/RR| G)/RR Clear-Block

Proceed; for passenger trains, manual block clear; for trains other than passenger trains, manual block clear outside yard limits.

[Revised 10/1964; previously: Proceed; manual block clear.]

281 G|/R| G|/R G>/R>z G>/Rz G</Y Clear

Proceed.

282 Y|/G| Y>/G>z Approach-medium

Proceed approaching next signal at Medium Speed.

NOTE - Trains may proceed approaching next signal at not exceeding 45 miles per hour at signals displaying a yellow triangle outlined in black.

283    R|/G| R)/G| Medium-clear

Proceed; Medium Speed through interlocking limits.

NOTE 1 - Trains may at not exceeding 45 miles per hour within interlocking limits, at signals displaying a yellow triangle outlined in black.

NOTE 2 - In cab signal territory with fixed automatic block signals, trains with cab signals not in operative condition or not equipped with cab signals, must not exceed Medium Speed.

283A Medium-approach

Proceed at Medium Speed prepared to stop at next signal. Train exceeding Medium speed must at once reduce to that speed.

284   Approach-slow

Proceed approaching next signal at Slow speed. Train exceeding Medium speed must at once reduce to that speed.

285 Y|/R| Y|/R Y>/R>z Y>/Rz Approach

Proceed prepared to stop at next signal. Train exceeding Medium speed must at once reduce to that speed.

285A Y</Y Caution

Train exceeding Medium speed must at once reduce to that speed. Where a facing switch is connected with the signal, approach that switch prepared to stop. Approach next signal prepared to stop.

287 g| g Slow-clear

Proceed; Slow speed within interlocking limits.

288    yf Slow-approach

Proceed prepared to stop at next signal. Slow speed within interlocking limits.

289 Y)/RR| Y)/RR Permissive-Block

Block occupied; for passenger trains, stop; for trains other than passenger trains, proceed prepared to stop short of obstruction, but not exceeding 15 miles per hour.

290 R|/Y| R)/Y| y/ y Restricting

Proceed at Restricted speed.

291 R>/R>z R>/Rz Stop-and-proceed

Stop, then proceed at Restricted speed.

NOTE - Freight trains of 90 or more cars or having tonnage of 80 per cent or more of the prescribed engine rating may proceed at Restricted speed without stopping at signals displaying a yellow disc on which is shown the letter "G" in black.

The engineman must be notified as to tonnage and number of cars in train before leaving terminals and when consist is changed enroute.

292 R|/R| R)/RR| R|/R R)/RR r| r Stop-signal

Stop.

293 [lantern on post, red in middle, yellow to left, station name vertically on post] Block-limit

Limit of the block.

293A [yellow sign, black letters vertically: A B L] Approach block-limit

Proceed prepared to stop at next Block-limit signal. Train exceeding Medium speed must at once reduce to that speed.

NOTE - Will not apply to trains authorized to pass the Block-limit station as though Clear-block signal were displayed.

294 [flashing illuminated letter "O" on left side of signal mast] [lantern hung in front of yellow fish-tail flag hanging down] Train-order

Orders.

NOTE - By day the yellow lamp not displayed.

When displayed in the direction of an approaching train or trains, must not be passed by any such train on any track except as provided by Rule 221.

295 [Color light signal, green lamp on top lit] Clear distant switch signal

Switch closed, proceed.

296 [Color light signal, yellow lamp on bottom lit] Caution distant switch signal

Switch open. Approach all switches connected with the signal prepared to stop short of the switches.


Mark D. Bej, M.D.
bejm@ccfadm.eeg.ccf.org
+216-444-0119
1997.03.27