A well put together Southern "King Arthur" which steams freely and runs well - we've had this one running on the rolling road much of this morning, impressed by how well it goes.
Silver soldered superheated copper boiler, 80psi working pressure, feed by twin injectors and axle pump with auxiliary hand pump in the tender. Cast iron cylinders with piston valves actuated by Walschaert's gear with screw reverser in the cab, twin mechanical lubricators. Screw-down brake to engine and tender.
There's some video of it running in the workshop here - and before anybody asks, yes we have got the brass cab spectacle frames (they arrived some time after the engine).
Locomotive 42 inches
Tender 30 inches