Large train, small travel path?

I’m looking for a large train with a small travel path. I have a 22" ledge and would like to run a train on it. It is 2’ overhead and would like the train to be large enough to see. Does such a train exist? Even if it is more of a toy than a hobby train? Thanks!

If you want to just go round and round G scale comes to mind.

Your description is a little confusing. Is it a shelf that runs around the room 22" wide? or 22" x 6 or 8’ long? Does 2’ overhead mean it’s 2’ down from the ceiling? Pleasy clarify!![%-)]