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Signals... There are two ways for a signal to go green, or "proceed" and tell the engineer to go. 1. CTC..Central Traffic Control ...think remote control from a dispatcher miles away who turns a switch (old days) or touches a computer screen (now days) to set up the signal. 2. ABS...automatic block signals...this is automatic, and the signal goes green when whatever made it go red is gone. The engineer will move the train if the rules (another set of discussions) allow him to go. There is a lot more to signals, but the basics are "fail safe" if something is wrong or broken, the signals are set to stop, even if there is no signal when one is expected, the engineer must stop. Moving a train requires meeting operating rules and signal safety. Few have ever been hurt by a standing train. Be SAFE..Stay in the Clear (that means off the railroad tracks)
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