A railway line has a double track, except in a tunnel .................. However, they do not crash. Why? A railway line has a double track, except in a tunnel where there was no room for a double track. A train goes into the tunnel in one direction, and another one enters in the opposite direction. Both trains are traveling fast. However, they do not crash. Why?
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may be Both the train went at different time
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Both the train went at different time
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