Interesting question, Pappy Fiddle. Norm Cohen's Long Steel Rail is the most comprehensive train song book I know of. It says "Reuben's Train" is one title for a number of songs in the "Train 45/500 Miles/900 Miles" group. It's one of the most commonly-sung railroad songs, and it has countless versions. None of these songs seem to have any tie to the locomotive you've found, so I'm wondering if there is no connection between your locomotive and the song. Cohen makes no mention of Reuben Wells, either the person or the locomotive.

Maybe you're right and the locomotive and song are connected, but I'm not willing to buy into that yet.

The Reuben Wells locomotive is an 0-10-0, a very interesting wheel configuration. Hope I get a chance to see it some day.

-Joe-