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Good ones there - as far as I know: 1) Well, it used to be during Timetable & Train Order operation that if there were two opposing trains, or a faster train coming up on an inferior train, the inferior train had to clear. Who was inferior? Well, back then, scheduled trains were conferred classes: first, second, and third. Then there were the "extras" - unscheduled trains, that had to keep out of the way of scheduled ones. If there were two trains of the same class opposed to one another, the one traveling in a certain direction (specified by the timetable) had to clear: for example, on a particular railroad, all eastbound trains might have to clear all westbound trains of the same class. Of course, nowadays there are no scheduled trains and it's all done on a case-by-case basis! 2) I wouldn't even know where to begin! I'll refer you to these extremely cool links that give you a pretty good idea: http://www.lundsten.dk/us_signaling/index.html Carsten Lundsten's excellent site on N. American dispatching and signals http://broadway.pennsyrr.com/Rail/Signal/ Mark D. Bej's sprawling site focusing almost entirely on signals, their application, and relevance to operation http://home.comcast.net/~candcb1/ As far as signals go, this last link is just plain cool! The Historical Reference of Operating Rules and Practices gives you an interesting view of the regional trends (i.e., western roads versus northeastern roads), and how it has evolved over the years. !
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