Interlocking Signals
Interlocking signals are used in interlockings, which are any areas where train movements may conflict with each other. They are controlled by either human operators or a computer, not by the trains. Interlocking signals also tell operators which way points are set. The following interlocking signals are used on the TTC.
| Proceed, Points Set to Straight | |
| Proceed With Caution, Points Set to Straight, Next signal is currently red | |
| Proceed With Caution, Points Set to Diverge | |
| Stop And Stay | |
| Call On (Train has been given permission to pass red signal) | |
| Entering Timed Block, Points Set to Straight, next signal is red only due to grade timing | |
| Entering Timed Block, Points Set to Diverge | |
| Timed Block, timer has not yet run out (top red light flashes when timer is about to run out), next block is timed as well as lunar aspect is indicated (in this example this signal would only clear to yellow over green) |
Read more about this topic: Toronto Subway And RT Signals
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