I play a lot of trainbuild on GMod and so far I've been getting a lot of trains from Synth.
I've decided on a company name "El Camino Del Rojo," which is supposed to translate to "The way of the Red," which is supposed to somewhat represent the red mountains in West Coast America.
Hopefully most of my trains (the older models,) will have this logo on them. Others just have text.

(oh yeah, the image in the middle was ripped off of google, so its not originally mine.)