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Uh, are you guys sure that the P doesn't stand for "post" as in, this signal is standing on a post - this particular part, where this letter "P" is affixed is the post. <br /> <br />Nah, maybe not. As noted above, you have absolute signals that often have an "A" on them - do not pass these - ever - (also do not pass go, do not collect $200); and then you have permissive signals that you can pass at restricted speed. P = Permissive. You may also see some that have a "G" (for "Grade")which someone also mentioned above. Its a special kind of permissive, when you're on a upgrade that could cause you to stall - again you can pass at resticted speed. You'll also see some that have "D" affixed. This will usually be on the lower of two signal heads that are on the same post. The D = Distant, and is telling you, in advance, what the next signal is going to say. i.e. the lower head is the "distant" signal and is telegraphing to you what you will see a mile or so up the track when you get to the next signal. Kinda like ESP for locomotive engineers.
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