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I'll try to answer the signal question- <br />when train passes green signal it triggers some sensor that makes the light turn red. It will remain red until that train either passes the next signal or it will change from red to amber "approach" after a certain period of time. Its kinda similar with meeting trains- first train to reach the signal on one end of the block (distance between two signals) wins. The slower train has to wait on the siding until the other one clears that block. yeah. <br /> Please correct me if i'm wrong.
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