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why do trains go back and forth

Take this example of an intersection that can cause deadlocks: (which is basically A train coming from the bottom will get to chain signal 1 and choose to go left or right. If it goes right then it has only one way out which is through signal
2b. This is fine. But if the train chooses to go left, then it goes through chain signal 2a and still has more than one possible way out of the intersection: the paths that go through chain signals 3a and 3b.


Now somewhere between 1 and the track split before 3a and 3b the train can, under certain circumstances, suddenly change its mind and go the other path. This is a problem because chain signals only reserve the path that a train intends to take and usually trains stick with that decision. But when it suddenly changes its route mid-intersection, it may find that the way out is blocked (because it wasn t reserved) and stop on a physics-defying dime.


Now if you imagine another train coming from the north and doing the same thing, (taken from ). This intersection on the other hand is designed so that once the train is in the intersection and able to block other trains, it has only one way out: Media upload failed. You can try again to add the media or go ahead and post the answer Media upload failed. You can try again to add the media or go ahead and post the question Uploaded image is less than minimum required 320x240 pixels size.


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