Argyle Forney.

Based on the Baldwin SR & RL #20, this Argyle locomotive incorporates inside-frame Stephenson valve gear, alcohol or butane firing, safety valve, water glass, pressure gauge, blow down valve, regulator, and displacement type lubricator. Minimum radius is 1.6 meters. Available for both 32mm and 45mm gauge. R/C and whistle are optional.

Apple QuickTake photograph by Richard Finlayson.