Signals on the TTC
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The Toronto Transit Commission, or TTC, like most transit systems, uses a system of light-based signals to give instructions to their trains. They use block signals commonly, as well as interlocking signals. The TTC uses the NX/UR system of signalling, which is also used in New York, Chicago, and Boston.
[edit] Block Signals
Block signals are the most commonly used signals on the TTC. They are used to keep trains properly spaced, and are controlled by the trains themselves, based on their distance relative to other trains. The following block signals are used by the TTC.
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Proceed |
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Proceed With Caution |
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Stop And Stay |
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Entering Timed Block |
[edit] Interlocking Signals
Interlocking Signals are used in interlockings, which are any areas where train movements may conflict with each other. They are either controlled by human operators or a computer, not the trains. Interlocking signals also tell operators which way points are set. The following interlocking signals are used on the TTC.
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Proceed, Points Set to Straight |
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Proceed With Caution, Points Set to Straight |
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Proceed With Caution, Points Set to Diverge |
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Stop And Stay |
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Call On (Train has been given permission to pass red signal) |
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Entering Timed Block, Points Set to Straight |
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Entering Timed Block, Points Set to Diverge |
