I dunno jack about shit, just passing through. I'll guess it's for mining because it's so low and small.

Looks like this thing

https://thenationaldesk.com/news/from-the-desk/1920s-era-locomotive-found-in-search-of-sc-river

It went "zip" when it moved
And "bop" when it stopped
And "whirr" when it stood still
I never knew just what it was
And I guess I never will

First prototype for the killdozer

the front (almost) fell off