Quote:
Originally Posted by NatashaH
24hr service has been proposed, but the main thing that is holding the TTC back is the old signaling system in place. The TTC is replacing the old signaling system (and have been for years) with a new one. The new system will make 24hr service possible.
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IMO type of signaling system has got nothing to do with availability of 24h service. Most probably the existing system is a track circuit based one with a headway worse than 4 minutes and again probably is being replaced with a communications based one in order to get a better headway.
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