Specifically, I watched Buster Keaton's film 'The General'. Released in 1926 it tells the story of a stolen locomotive train in the mid-west, where Keaton's character chases it alone, through the country desert across enemy lines. This film was very helpful in resolving my story, as it includes a lot of gags and uses for wild-west environments, a couple of which I am adapting into my own short. A lot of the film takes place on a steam train also, which gives great references.
One such scene which I am taking inspiration for is this one pictured below. Keaton's character catches up with the stolen train by riding on a handcar (or a pump trolley) Something which I am determined to make my character do in a more heroic moment. I still have a few more shorts of his to watch along with some other comedy, but I think I am closer to a resolved story.