I'm looking for a nice 50 degree crossing buck I could reskin after getting permission. They were popular in North America in the 1950's. Here's some drawings of one used on the SLSF railroad.
Does anyone know of one that I could look at for reskinng?
That looks just like the standard crossbuck used at level crossings here in Australia. There have been numerous examples of this kind of sign made in Trainz since the beginning, however, being Australian they naturally say 'RAILWAY' instead of 'RAILROAD' - but that's not an issue as you say you plan on reskinning it anyway.
As a start, here are a couple of the better Aussie crossing signs that resemble the sign you're after:
'Roadsign unprotected crossing' by Natvander: kuid:61119:100990
'Sign Xing Rural Oz' - a default item by Auran: kuid:-12:164