As the train passes from block to block, the signal at the
beginning of the block turns red, but the trip arm remains down.
last car of the train leaves the block, the stop arm goes up.
When the last
car of the train leaves the second block, the signal turns yellow and the stop
arm goes down.
This insures that there are at least 2 red signals and one
raised stop arm behind the train.
When the train leaves the next block, the
first signal turns green.
How Grade Time Signals
How Station Time Signals
D. Korman - The JoeKorNer