Marx Toy

How do I find out more about a WWI circa Marx Toy Train set? It is made of metal and has a detachable tank?

It is in fair shape with all but the transformer working. I am trying to get an idea as to the value of the set and get it in working shape

Sample current price lists are available at the following web page. Search for the train components you have.

Vintage Marx Toy Wind-up Dipsy-Doodle Bug Dodg’em Car