Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

If your main goal is small footprint and doubleacting, you will have a hard time neglecting a Jensen 35.

They are VERY nice strong runners, and a great boon in their favour, is that they are plentiful enough to be bought for "pocketchange", if willing to wait for the right one on Ebay.

It is an overtype, but that wouldn´t make it a vertical...which dictates that it must be horisontal then