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I have noticed on a lot of BNSF symbols that they use two different symbols to represent Chicago(CHC and CHI). Is there a reason why they do this or not, I was thinking maybe they are two different terminals in the Chicago area that they run them to, but I am not sure. Alos it seems sometimes on some symbols they insert a Z in place of the letter that is normally there like(BPA-BPZ)or (NBY-NBZ)What's with this. Any help
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