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This is an interesting question, but maybe it would have been better to clarify the question in the first thread rather than starting a second thread.  If I understand the answer to the question, it is this: <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p> If you have clear cab signals, you can proceed at track speed unless told otherwise, even if there is zero visibility ahead.  But if you think it is unsafe to do so, you may slow down to whatever speed you think is safe. <o:p></o:p> Is that the correct answer?    If it is, it seems like an odd way to handle the situation.  It has been mentioned that engineers are supposed to know where the grade crossings are.  It is one thing to know their location in relation to other landmarks, but if you painted the windows black, would engineers know exactly when the train is approaching a crossing?  Would they calculate location by reconciling speed against elapsed time?
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