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Tomorrow, I expect we will be told that the signals were tested.  If there was nothing wrong with the signals, what probable causes are left?  What is the probability of ineffective braking? I recall an incident near here where a train was approaching an interlocking crossing that the operator did not line up for some reason.  The engineer discovered that he did not have any air that he could exhaust, so he reversed the engines.  The air problem was said to be due to ice in the trainline.  Do railroads use any powered mainline derails in conjunction with interlocking systems these days?
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