Photo of Nez on the original Loco-Motion in front of Joe Hurst's house in 1969. That kid was probably never quite the same. photo courtesy of Joe Hurst.Here's where it gets interesting. From what I've found, the above photo is not the record's first release cover art, but likely from a later release. It has Loco-Motion in a jumbled type similar to the way it's written on the tank, so I suppose the Nez got the idea from this cover. It does also have a train on it. An internet search will show several other versions of the cover with trains on them too, so in a round about way there is a train connection.
These are the best photos I can find of both versions of the tanks. Nez's original paint on the left (on the Vincent experiment), and Dick's on the right.