A 5 inch gauge Polly II, 0-4-0 with tender. Silver soldered copper boiler, 90psi working pressure, feed by injector and axle pump with auxiliary hand pump in the tender. Cast iron cylinders with slide valves actuated by Stephenson's gear, pole reverser in the cab, mechanical lubricator.
The engine runs well, we had it going on the rolling road outside in the sunshine last week - there's a clip here.
Locomotive 29 inches
Tender 18 inches