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Signals, interlockings, etc
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I've seen yellow signs with a red stripe on the Wisconsin Central; the equivalent on the UP is a square-shaped sign divided into four "45-45-90" triangles; the upper and lower two are yellow and the two on the sides are red. It means - under GCOR rules - that, once the engineer has reached a point two miles beyond said signs ("flags" in the rulebook), he is to proceed at restricted speed prepared to stop for workers, equipment on the track, or a red flag. (S)he can resume speed one the rear of the train passes the green flag. <br /> <br />Just a plain old yellow flag with no red (stripe, triangles or otherwise) means that two miles ahead, speed is restricted due to track conditions, but the engineer doesn't necessarily have to prepare to stop for workers and equipment. <br /> <br />Under NORAC rules, it's handled a bit differently - I think work areas are called "Restricted Areas" or something to that effect. At the beginning of the area (as opposed to a certain distance in advance, as under GCOR) there's a diamond-shaped sign with a red "S" (for "speed limit", I think) and the engineer can't exceed 30 MPH. Once again, the train can resume speed once its rear has passed the correct sign - in this case, a sign with a green "R" (for "resume speed.")
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