On some US routes, I have come across locations where signals are placed at very short distance from each other. The question is what aspect approach signals should show in this situation.
Here is an example for Whitefish route.

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Speed in this area is 40 mph. As can be seen, signal A is just a short distance from signal B. If signal A is at danger, signal B will show approach.
But what aspect is shown on the signal before B? According to the chards, this should be clear or, if 4 light aspect is available, advance approach. But if signal B is approached at the speed which is normally maintained after passing a signal at clear or advanced approach, clearly the train will not be able to stop at signal A.
Are there special rules for situations like this (of which there are quite a few on the Whitefish route, and on other routes as well).
These situations also occur on European routes but I do know that these are indeed handled in special ways in various European systems. But I have not come across any information how this is handled in US systems.
Or, indeed, is this placement not realistic and are these to be considered as errors in the route creation?
Regards,
Rob Roeterdink