Lionel used to make a very nice-looking Caterpillar steam locomotive set. I found a photo of someone's HO Caterpillar train set, and I found a plastic Caterpillar train set.
I cannot find any real-life Caterpillar trains except that there actually are Caterpillar flatcars for carrying their products.
Vince
It sounds like you are at the next stage of the train hobby: Build & Bash......
Fortunately/Unfortunately we do get to the stage where we want a "long out of production or a Never Was" train of piece of rollingstock.
And the ONLY was we're going to get it, is to build or bash...
There are lots of donor/inexpensive pieces of rolling stock to test your build/bash skills upon to get what you want.
IF YOU BUILD IT, YOU'LL HAVE IT....
Happy Rails...
dave
Thank you, Dave.
And I corrected an error in my previous post. There really are Caterpillar flatcars, but I cannot find photos of actual John Deere railcars of any type.
Excellent link Dave. John Deere currently makes PARTS for railroad equipment, although they do not manufacture any locomotives or railcars.