This could be a hobby all by itself. Build a simple loop of track, maybe with a storage siding, and just build and run models of all these rail trucks. This is Jose's fifth set of photos on the subject. There's about 25-30 unique prototypes in just those threads, and probably hundreds more across the Internet.
The B&O Chicago Terminal speeder is freaking adorable. This one begs to be modeled on a micro layout with impossibly small radii. The Model T railcar built by the teen is also a gem. Can you imagine the list of laws, environmental regulations and prohibitions it would violate today? I know we live in a "more progressive and enlightend" time now, but what a marvelous contraption. Keep 'em coming Jose.Lou