Signal Aspects: SCL

Signal Aspects -- SCL

Seaboard Coast Line


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From CSX Transportation Operating Procedures Manual, 15 March 1996. Comments regarding older usage welcome.

Diagrams for dwarf signals are not yet available, but these are identical, if smaller, versions of the high signals.

In the rulebook, the signals are shown with square (sic!) heads. Staggered aspects are shown also, but these do not have a number plate as drawn in the rulebook. Some semaphore aspects are omitted.

Note that these signals and the C&O signals, both in the same rulebook, conflict to some degree; these SCL signals are the more "standard" of the two versions. I would like to know from any knowledgeable party (1) what style signals is replacing B&O signals, and (2) how do engineers from the ex-SCL and the ex-C&O/B&O reconcile these differences in signalling?

Rule # Aspect(s) Aspect Name Indication
281    g/g Clear Proceed.
281B y/gf Approach Limited Proceed, approaching next signal not exceeding Limited Speed.
281C r/gf Limited Clear Limited Speed through turnouts, crossovers, sidings, and over power-operated switches; then proceed.
281D r/yf Limited Approach Limited Speed through turnouts, crossovers, sidings, and over power-operated switches; then proceed, prepared to stop at next signal.
282 y/g Approach Medium Proceed, approaching next signal not exceeding Medium Speed.
282A Advance Approach Proceed, prepared to stop at second signal.
283 r/g Medium Clear Medium Speed through turnouts, crossovers, sidings, and over power-operated switches; then proceed.
283A Medium Approach Medium Medium Speed through turnouts, crossovers, sidings, and over power-operated switches; then proceed approaching next signal not exceeding Medium Speed.
283B Medium Approach Slow Medium Speed through turnouts, crossovers, sidings, and over power-operated switches; then proceed approaching next signal not exceeding Slow Speed.
283C y/y Medium Advance Approach Medium Speed through turnouts, crossovers, sidings, and over power-operated switches; then proceed, prepared to stop at second signal.
284 Approach Slow Proceed, approaching next signal not exceeding Slow Speed.
285 Approach Proceed prepared to stop at the next signal. Trains exceeding medium speed must immediately begin reduction to medium speed as soon as the engine passes the Approach Signal.
286 r/y Medium Approach Medium Speed through turnouts, crossovers, sidings, and over power-operated switches; then proceed prepared to stop at next signal.
287 g/r g Slow Clear Slow Speed through turnouts, crossovers, sidings, and over power-operated switches; then proceed.
288 y/r y Slow Approach Slow Speed through turnouts, crossovers, sidings, and over power-operated switches; then proceed prepared to stop at next signal.
290 u/r r/u u Restricting Proceed at Restricted Speed.
291 r/r/# p/r Stop and Proceed STOP, then proceed at Restricted Speed.
292 r/r r Stop Stop.
293 [black C on round white] Stop and Check Stop and check position of drawbridge, spring switch, derails or gates protecting railroad crossings. If way is clear and drawbridge, spring switch, derails or gate are in proper position, proceed at Restricted Speed.
294 [illuminated S] Stop and Open Switch Stop and open hand-operated switch.
295 [signal, black APP on round white marker below] APP Proceed, approaching next signal as authorized by the aspect displayed. If signal is dark, proceed prepared to stop at next signal until it can be plainly seen that indication of next signal allows train to proceed.
296 Doll Arm A track intervenes between the signal and the track governed by the signal.
297 Adjacent or Bracketed Signals Right hand signal governs right hand track and left hand signal governs left hand track.
298 R/R/R/g R/R/G R/G r/r/G R/r [G on yellow round] Grade Proceed at Restricted Speed.

Relevant Definitions:

Absolute Block
A block that may be occupied by only one train at a time.
Absolute Signal
A color light, color position light, or semaphore signal without a number plate, "P" marker, "APP" marker, "C" marker, or "G" marker, that conveys Stop as its most restrictive aspect.
Automatic Block Signal System (ABS)
A series of consecutive blocks whose use is governed by train[-]actuated block signals or by certain conditions affecting the use of a block. Unless so specified, such signals do not authorize the movement of trains.
Block
A track section of defined limits. In signaled territory, a block is the track section between two consecutive block signals governing movements in the same direction. It is also the track section from a block signal to the end of signaled territory.
Block Signal
An absolute or intermediate signal at the entrance to a block that governs the movement of trains using that block.
Color Light Signal
A fixed signal that displays aspects by the color of a light. It may also display aspects by a combination of colored lights.
Color Position Light Signal (CPL)
A fixed signal that displays aspects by the color or positoin of two or more lights.
Current of Traffic
The movement of trains on a main track, in one direction, as specified by the rules or special instructions.
Direct Traffic Control Block
A block whose use is governed by verbal authority of the train dispatcher.
Fixed Signal
A permanent signal or sign indicating a condition affecting train movement.
Interlocking
An arrangement of interconnected signals and signal appliances for which interlocking rules are in effect. Signals and movement of signal appliances must succeed each other in proper sequence.
Interlocking Signals
Fixed signals of an interlocking.
Intermediate Signal
A block signal equipped with either a number plate, a "G" marker, or "P" marker. It conveys Stop and Proceed at Restricted Speed as its most restrictive indication.
Main Track
A track extending through yards and between stations. It is other than an auxiliary track.
Siding
An auxiliary track for meeting or passing trains. It is designated in special instructions.
Speeds
Controlled Speed
A speed that will permit stopping within one-half the range of vision. It will also permit stopping short of a train, a car, an obstruction, on-track equipment or a stop signal.
Limited Speed
A speed not exceeding 45 miles per hour.
Medium Speed
A speed not exceeding 30 miles per hour.
Restricted Speed
A speed that will permit stopping within one-half the range of vision. It will also permit stopping short of a train, a car, an obstruction, on-track equipment or a stop signal, a derail, or an improperly lined switch. It must permit looking out for broken rail. It will not exceed 15 MPH.
Slow Speed
A speed not exceeding 15 miles per hour.
Traffic Control Signal System (TCS)
A signal system under which opposing and following train movements are authorized and governed by block signals.
Train
An engine, with or without cars, displaying a marker.


Mark D. Bej, M.D.
bejm@ccfadm.eeg.ccf.org
+216-444-0119
1996.10.12