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Old 11-13-2011, 01:29 PM   #56
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I don't know the rule, but I have been told that a yellow sign like that, but without the slash, indicates a slow order in a short section. The kind of sign I am talking about is yellow on one side and green on the other, and they are placed in pairs. So an approaching train first sees the yellow, and slows down, and then sees the green, and can speed up again, and a train in the other direction also sees the yellow first and then the green.

When I saw this used a few month ago, the signs were only maybe 20 yards apart, as the issue was a particular spot on the rail.
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