Bob,
I have the Conrail markings in vector form, from all the CR stuff I've done. PM me the scale height of the herald, railroad name and reporting marks, as well as what car numbers you want and I'll send them to you in AI 7.0 format. You can use Arial bold for the dimensional/service data - probably 2 scale inches in height.
Your Penn Central reporting mark numbers look a little off to me. They should be the PRR Transition font. I have that as well.