401. Location
Wherever practicable, fixed signals other than switches will be located above, or to the right of, the track they govern. Where circumstances require that signals be otherwise placed, such conditions will be indicated by GBO or special instructions.
EXCEPTION: A block or interlocking signal that is required to be placed to the left of the track it governs need not be indicated by GBO or special instructions, provided that such location does not place the signal to the right of another signalled track.
401.1 Signal Displayed
The indications displayed on block and interlocking signals govern operation to the next signal or block end sign. Except as otherwise specified in special instructions, a signal to leave the main track to enter non-main track applies to the block end sign or until the leading end of the movement has passed entirely through the controlled location and entered non-main track. Speed requirements protecting turnouts must be complied with until the entire movement has cleared the turnout.
401.2 No Advance Signal
At locations where there is no advance signal to the signal governing movements into CTC or movements are re-entering CTC from a siding, all movements must approach the governing signal preparing to stop until it can be observed as displaying a more favourable indication than Stop.
402. Positioning
Where conditions allow, block and interlocking signal heads will be positioned with respect to the tracks on which they affect movements. Bridges, cantilevers, dummy masts and other structures will be used and must be illustrated in company instructions to ensure proper understanding or signal intent.
403. Appearance of Colour Light Signals
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(a) Block and interlocking signal aspects will be displayed by the colour, position, flashing of lights, or combinations thereof.
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(b) The indications of any such signal may be qualified or modified by an attached arrow and/or plate(s).
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(c) Lights may be attached to either side of the signal mast and number plates may be provided for the purpose of identifying the location.
404. Standard Indications
The illustrations in Rules 405-440 are standard aspects and indications. Other signal aspects and indications necessary will be illustrated in special instructions.
Block and Interlocking Signals
405.
Clear - Proceed.
1. A high mast, single aspect signal displaying green.
2. A high mast, staggered, double aspect signal displaying green on the top, red on the bottom.
3. A high mast, inline , double aspect signal, displaying green on the top, red on the bottom.
4. A high mast, inline, triple aspect signal, displaying green on the top, red in the middle, red on the bottom.
5. A double aspect, dwarf signal, displaying green on the top, green on the bottom.
406.
Clear to Limited - Proceed, approaching next signal at LIMITED speed.
1. A high mast, staggered, double aspect signal displaying yellow on the top, flashing green on the bottom.
2. A high mast, staggered, double aspect signal displaying yellow on the top, green on the bottom with an ‘L’ plate on the mast.
3. A high mast, inline, double aspect signal displaying yellow on the top, flashing green on the bottom.
4. A high mast, inline, double aspect signal displaying yellow on the top, flashing green on the bottom with an ‘L’ plate on the mast.
5. A high mast, inline triple aspect signal displaying yellow on the top, flashing green in the middle, red on the bottom.
6. A high mast, inline triple aspect signal displaying yellow on the top, flashing green in the middle, red on the bottom with an ‘L’ plate on the mast.
7. A high mast, inline triple aspect signal displaying green on the top, red in the middle, flashing green on the bottom.
8. A double aspect, dwarf signal, displaying yellow on the top, flashing green on the bottom.
9. A double aspect, dwarf signal, displaying yellow on the top, green on the bottom with an ‘L’ plate on the mast.
407.
Clear to Medium - Proceed, approaching next signal at MEDIUM speed.
1. A high mast, staggered, double aspect signal displaying yellow on the top, green on the bottom.
2. A high mast, inline, double aspect signal displaying yellow on the top, green on the bottom.
3. A high mast, inline, triple aspect signal displaying yellow on the top, green in the middle, red on the bottom.
4. A high mast, inline, triple aspect signal displaying green on the top, red in the middle, green on the bottom.
5. A double aspect, dwarf signal, displaying yellow on the top, green on the bottom.
408.
Clear to Diverging - Proceed, approaching next signal at DIVERGING speed.
1. A high mast, staggered, double aspect signal displaying yellow on the top, flashing yellow on the bottom with a ‘DV’ plate on the mast below the signal.
2. A high mast, staggered, double aspect signal displaying yellow on the top, yellow on the bottom with a ‘DV’ plate on the mast below the signal.
3. A high mast, inline, double aspect signal displaying yellow on the top, yellow on the bottom with a ‘DV’ plate on the mast below the signal.
4. A high mast, inline, triple aspect signal displaying yellow on the top, yellow in the middle, red on the bottom with a ‘DV’ plate on the mast below the signal.
5. A high mast, inline, triple aspect signal displaying green on the top, red in the middle, flashing yellow on the bottom with a ‘DV’ plate on the mast below the signal.
6. A double aspect, dwarf signal, displaying yellow on the top, yellow on the bottom with a ‘DV’ plate on the mast.
409.
Clear to Slow - Proceed, approaching next signal at SLOW speed.
1. A high mast, staggered, double aspect signal displaying yellow on the top, flashing yellow on the bottom.A high mast, staggered, double aspect signal displaying yellow on the top, yellow on the bottom.
2. A high mast, inline, double aspect signal displaying yellow on the top, yellow on the bottom.
3. A high mast, inline, triple aspect signal displaying yellow on the top, yellow in the middle, red on the bottom.
4. A high mast, inline, triple aspect signal displaying green on the top, red in the middle, flashing yellow on the bottom.
5. A double aspect, dwarf signal, displaying yellow on the top, yellow on the bottom.
410.
Clear to Restricting - Proceed, next signal is displaying restricting signal.
1. A high mast, staggered, double aspect signal displaying yellow on the top, flashing red on the bottom.
2. A high mast, inline, triple aspect signal displaying yellow on the top, red in the middle, flashing red on the bottom.
411.
Clear to Stop - Proceed, preparing to stop at next signal.
1. A high mast, single aspect signal displaying yellow.
2. A high mast, staggered, double aspect signal displaying yellow on the top, red on the bottom.
3. A high mast, inline, double aspect signal displaying yellow on the top, red on the bottom.
4. A high mast, inline, triple aspect signal displaying yellow on the top, red on the middle, red on the bottom.
412.
Advance Clear to Limited - Proceed, approaching second signal at LIMITED speed.
1. A high mast, staggered, double aspect signal displaying flashing yellow on the top, flashing green on the bottom.
2. A high mast, inline, double aspect signal displaying flashing yellow on the top, flashing green on the bottom.
3. A high mast, inline, triple aspect signal displaying flashing yellow on the top, flashing green in the middle, red on the bottom.
413.
Advance Clear to Medium - Proceed, approaching second signal at MEDIUM speed.
1. A high mast, staggered, double aspect signal displaying flashing yellow on the top, green on the bottom.
2. A high mast, inline, double aspect signal displaying flashing yellow on the top, green on the bottom.
3. A high mast, inline, triple aspect signal displaying flashing yellow on the top, green in the middle, red on the bottom.
414.
Advance Clear to Slow - Proceed, approaching second signal at SLOW speed.
1. A high mast, staggered, double aspect signal displaying flashing yellow on the top, yellow on the bottom.
2. A high mast, inline, double aspect signal displaying flashing yellow on the top, yellow on the bottom.
3. A high mast, inline, triple aspect signal displaying flashing yellow on the top, yellow in the middle, red on the bottom.
414A.
Advance Clear to Diverging - Proceed, approaching second signal at DIVERGING speed.
1. A high mast, staggered, double aspect signal displaying flashing yellow on the top left, yellow on the lower right with a ‘DV’ plate on the mast below the signal.
2. A high mast, inline, double aspect signal displaying flashing yellow on the top, yellow on the bottom with a ‘DV’ plate on the mast below the signal.
3. A high mast, inline, triple aspect signal displaying flashing yellow on the top, yellow in the middle, red on the bottom with a ‘DV’ plate on the mast below the signal.
415.
Advance Clear to Stop - Proceed, prepared to Stop at second signal.
1. A high mast, single aspect signal displaying flashing yellow.
2. A high mast, staggered, double aspect signal displaying flashing yellow on the top, red on the bottom.
3. A high mast, inline, double aspect signal displaying flashing yellow on the top, red on the bottom.
4. A high mast, inline, triple aspect signal displaying flashing yellow on the top, red in the middle, red on the bottom.
416.
Limited to Clear - Proceed, LIMITED speed passing signal and through turnouts.
1. A high mast, inline, triple aspect signal displaying red on the top, flashing green in the middle, red on the bottom.
2. A high mast, inline, triple aspect signal displaying red on the top, green in the middle, red on the bottom with an ‘L’ plate on the mast.
3. A double aspect, dwarf signal displaying flashing green on the top, red on the bottom.
4. A double aspect, dwarf signal displaying green on the top, red on the bottom with an ‘L’ plate on the mast.
417.
Limited to Limited - Proceed, LIMITED speed passing signal and through turnouts, approaching next signal at LIMITED speed.
418.
Limited to Medium - Proceed, LIMITED speed passing signal and through turnouts, approaching next signal at MEDIUM speed.
419.
Limited to Slow - Proceed, LIMITED speed passing signal and through turnouts, approaching next signal at SLOW speed.
1. A high mast, inline, triple aspect signal displaying red on the top, flashing green in the middle, flashing yellow on the bottom.
2. A double aspect, dwarf signal displaying flashing green on the top, flashing yellow on the bottom.
419A.
Limited To Diverging - Proceed, LIMITED speed passing signal and through turnouts, approaching next signal at DIVERGING speed.
1. A high mast, inline, triple aspect signal displaying red on the top, flashing green on the middle, flashing yellow on the bottom with a 'DV' plate on the mast.
2. A double aspect, dwarf signal displaying flashing green on the top, flashing yellow on the bottom with a 'DV' plate on the mast.
420.
Limited to Restricting - Proceed, LIMITED speed passing signal and through turnouts, next signal is displaying restricting signal.
1. A high mast, staggered, double aspect signal displaying flashing green on the top, flashing red on the bottom.
2. A high mast, inline, triple aspect signal displaying red on the top, flashing yellow in the middle, flashing yellow on the bottom.
3. A high mast, inline, triple aspect signal displaying red on the top, yellow in the middle, flashing yellow on the bottom with an ‘L’ plate on the mast.
4. A double aspect, dwarf signal displaying flashing yellow on the top, flashing red on the bottom.
5. A double aspect, dwarf signal displaying flashing yellow on the top, flashing red on the bottom with an ‘L’ plate on the mast.
421.
Limited to Stop - Proceed, LIMITED speed passing signal and through turnouts, preparing to stop at next signal.
1. A high mast, inline, triple aspect signal displaying red on the top, flashing yellow in the middle, red on the bottom.
2. A high mast, inline, triple aspect signal displaying red on the top, yellow in the middle, red on the bottom with an ‘L’ plate on the mast.
3. A double aspect, dwarf signal displaying flashing yellow on the top, red on the bottom.
4. A double aspect, dwarf signal displaying flashing yellow on the top, red on the bottom with an ‘L’ plate on the mast.
422.
Medium to Clear - Proceed, MEDIUM speed passing signal and through turnouts.
1. A high mast, inline, triple as signal displaying red on the top, green in the middle, red on the bottom.
2. A double aspect, dwarf signal displaying green on the top, red on the bottom.
423.
Medium to Limited - Proceed, MEDIUM speed passing signal and through turnouts, approaching next signal at LIMITED speed.
1. A high mast, inline triple aspect signal displaying red on the top, green in the middle, flashing green on the bottom.
2. A double aspect dwarf signal displaying green on the top, flashing green on the bottom.
424.
Medium to Medium - Proceed, MEDIUM speed passing signal and through turnouts, approaching next signal at MEDIUM speed.
425.
Medium to Slow - Proceed, MEDIUM speed passing signal and through turnouts, approaching next signal at SLOW speed.
1. A high mast, inline , triple aspect signal displaying red on the top, green in the middle, flashing yellow on the bottom.
2. A double aspect dwarf signal displaying green on the top, flashing yellow on the bottom.
425A.
Medium to Diverging - Proceed, MEDIUM speed passing signal and through turnouts, approaching next signal at DIVERGING speed.
1. A high mast, inline , triple aspect signal displaying red on the top, green in the middle, flashing yellow on the bottom with a 'DV' plate on the mast.
2. A double aspect dwarf signal displaying green on the top, flashing yellow on the bottom with a 'DV' plate on the mast.
426.
Medium to Restricting - Proceed, MEDIUM speed passing signal and through turnouts, next signal is displaying restricting signal.
1. A high mast, staggered, double aspect signal displaying green on the top, flashing red on the bottom.
2. A high mast, inline, triple aspect signal displaying red on the top, yellow in the middle, flashing red on the bottom.
3. A double aspect, dwarf signal displaying yellow on the top, flashing red on the bottom.
427.
Medium to Stop - Proceed, MEDIUM speed passing signal and through turnouts, preparing to stop at next signal.
1. A high mast, inline, triple aspect signal displaying red on the top, yellow in the middle, red on the bottom.
2. A double aspect, dwarf signal displaying yellow on the top, red on the bottom.
428.
Diverging to Clear - Proceed, DIVERGING speed passing signal and through turnouts.
1. A high mast, staggered, double aspect signal displaying red on the top, green on the bottom with a ‘DV’ plate on the mast.
2. A high mast, inline, double aspect signal displaying red on the top, green on the bottom with a ‘DV’ plate on the mast.
3. A high mast, inline, triple aspect signal displaying red on the top, red in the middle, green on the bottom with a ‘DV’ plate on the mast.
4. A single aspect dwarf signal displaying green with a ‘DV’ plate on the mast.
5. A double aspect dwarf signal displaying red on the top, green on the bottom with a ‘DV’ plate on the mast.
429.
Diverging to stop - Proceed, DIVERGING speed passing signal and through turnouts preparing to stop at next signal.
1. A high mast, staggered, double aspect signal displaying red on the top, flashing yellow on the bottom with a ‘DV’ plate on the mast.
2. A high mast, inline, double aspect signal displaying red on the top, flashing yellow on the bottom with a ‘DV’ plate on the mast.
3. A high mast, inline, triple aspect signal displaying red on the top, red in the middle, flashing yellow on the bottom with a ‘DV’ plate on the mast.
4. A double aspect dwarf signal displaying red on the top, flashing yellow on the bottom with a ‘DV’ plate on the mast.
5. A single aspect dwarf signal displaying yellow with a ‘DV’ plate and an ‘A’ plate on the mast.
6. A single aspect dwarf signal displaying flashing yellow with a ‘DV’ plate on the mast.
430.
Diverging - Proceed at REDUCED speed, not exceeding DIVERGING speed passing signal and through turnouts.
1. A high mast, inline, double aspect signal displaying red on the top, yellow on the bottom with a ‘DV’ plate on the mast.
2. A high mast, inline, triple aspect signal displaying red on the top, red in the middle, yellow on the bottom with a ‘DV’ plate on the mast.
3. A double aspect, dwarf signal displaying red on the top, yellow on the bottom with a ‘DV’ plate on the mast.
4. A single aspect, dwarf signal displaying yellow with a ‘DV’ plate on the mast.
431.
Slow to Clear - Proceed, SLOW speed passing signal and through turnouts.
1. A high mast, staggered, double aspect signal displaying red on the top, green on the bottom.
2. A high mast, inline, double aspect signal displaying red on the top, green on the bottom.
3. A high mast, inline, triple aspect signal displaying red on the top, red in the middle, green on the bottom.
4. A single aspect, dwarf signal displaying green.
5. A double aspect, dwarf signal displaying red on the top, green on the bottom.
432.
Slow to Limited - Proceed, SLOW speed passing signal and through turnouts, approaching next signal at LIMITED speed.
432A.
Diverging to Limited - Proceed, DIVERGING speed passing signal and through turnouts, approaching next signal at LIMITED speed.
433.
Slow to Medium - Proceed, SLOW speed passing signal and through turnouts, approaching next signal at MEDIUM speed.
433A.
Diverging to Medium - Proceed, DIVERGING speed passing signal and through turnouts, approaching next signal at MEDIUM speed.
434.
Slow to Slow - Proceed, SLOW speed passing signal and through turnouts, approaching next signal at SLOW speed.
434A.
Diverging to Diverging - Proceed, DIVERGING speed passing signal and through turnouts, approaching next signal at DIVERGING speed.
435.
Slow to Stop - Proceed, SLOW speed passing signal and through turnouts, preparing to stop at next signal.
1. A high mast, staggered, double aspect signal displaying red on the top, flashing yellow on the bottom.
2. A high mast, inline, double aspect signal displaying red on the top, flashing yellow on the bottom.
3. A high mast, inline, triple aspect signal displaying red on the top, red in the middle, flashing yellow on the bottom.
4. A double aspect, dwarf signal displaying red on the top, flashing yellow on the bottom.
5. A single aspect, dwarf signal displaying yellow with an ‘A’ plate on the mast.
6. A single aspect, dwarf signal displaying flashing yellow.
436.
Restricting - Proceed at RESTRICTED speed.
1. A high mast, single aspect signal displaying red with an ‘R’ plate on the mast.
2. A high mast, staggered, double aspect signal displaying red on the top, red on the bottom with an ‘R’ plate on the mast.
3. A high mast, staggered, double aspect signal displaying red on the top, yellow on the bottom.
4. A high mast, inline, double aspect signal displaying red on the top, yellow on the bottom.
5. A high mast, inline, triple aspect signal displaying red on the top, yellow on the bottom.
6. A double aspect, dwarf signal displaying red on the top, yellow on the bottom.
7. A single aspect dwarf signal displaying yellow.
437.
Stop and Proceed - Stop, then proceed at RESTRICTED speed.
1. A high mast, single aspect signal displaying red.
2. A high mast, staggered, double aspect signal displaying red on the top, red on the bottom.
438.
Take or Leave Siding or Other Track.
1. A single aspect dwarf signal displaying flashing red.
2. A double aspect dwarf signal displaying red on the top, flashing red on the bottom.
3. A high mast, inline, double aspect signal displaying red on the top, flashing red on the bottom.
4. A high mask, inline, triple aspect signal displaying red on the top, red in the middle, flashing red on the bottom.
Indications will be specified in special instructions for each specific application of this signal.
439.
Stop - Stop.
1. A high mast, single aspect signal displaying red with an ‘A’ plate on the mast.
2. A high mast, inline, double aspect signal displaying red on the top, red on the bottom.
3. A high mast, inline, triple aspect signal displaying red on the top, red in the middle, red on the bottom.
4. A double aspect, dwarf signal displaying red on the top, red on the bottom.
5. A single aspect dwarf signal displaying red.
OPTIONAL: Unless required to clear a switch, crossing, controlled location, or spotting passenger equipment on station platforms, a movement not authorized by Rule 564 must stop at least 300 feet in advance of the STOP signal.
440. Direction Indicator
Flashing arrow indicators used in conjunction with block signals when illuminated, identify that the route at the next controlled location is displaying a permissive signal and the route is lined and secured as indicated by the direction of the arrow.
Example:
