Perhaps this is it:
https://www.youtube.com/watch?v=r6s4gOvoEgo
"B" for "Block", as in the start of a block or the end of a block?
I can't think of anything else. And I'm not sure why a cross shape when a simple post would do.
Today I was asked a question about a trackside marker. It was described to me as this:
1. Posted next to the tracks.
2. Approximately 5 feet in height
3. Shape of a cross
4. The letter 'B' on the cross
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