'Mountaineer' was built by the American Locomotive Co (Alco) in 1917 and is now preserved on the Ffestiniog Railway.
Frames, castings and boiler kit for 'Mountaineer' as designed by Don Young.
I think the majority of the available parts are here. The boiler kit currently sells for around £600 so I believe there is over £1000 worth of parts here if bought new.