The railroads in the US have a long tradition of 'boxcar art' where railroad workers and hobos would chalk their name or a drawing onto the side of a boxcar. This folk art goes back to the 19th century amd probably hit a peak in the mid to late 20th century.
Originally chalk, and now paint crayons, are the weapon of choice for monikers (tags, nicknames, cartoons) to be applied to the side of freight wagons. This is very much a precursor to aerosol /spray can graffiti.
In the US, interchange rules would mean that freight cars could travel all over North America and there is some great reading available on this art form.
The Massillon Museum did an exhibition in 2018, and this onine book is a great and interesting read; MONIKER.
There are some classic monikers around from yesteryear with some of the famous ones being Bozo Texino, Herby, Colossus of Roads, The Gambler, and The Kodak Kidd. The list goes on....
Such mystery and folk art appear saw a move created a few years back Who is BOZO TEXINO.
Anyway, I have noticed lately that MTWO and COLA have been doing tributes to these classic monikers on Sadleir RLSY and RLUY vans. Check them out below: