Ajax (5 Gauge)

Overview
Ajax is an 0-4-0 locomotive designed by Dick Simmonds. It was developed into the 0-6-0 locomotive Achilles and has a number of parts in common.

Features
Ajax uses twin water pumps driven by individual eccentrics on one of the driven axles. It uses Walschaert’s gear operating slide valves, controlled by a Pole reverser.

Known Issues

 * There are issues with the valve gear as the return crank provides too much movement. This in turn leads to overrun on the valves in full gear.

Dimensions

 * Cylinder Bore: 1.625"
 * Driving Wheel dia: 4.375
 * Length: 29"
 * Width 9.5"
 * Height 14.5"
 * Weight: 50 Kg Dry
 * Boiler Pressure (typical) 80 PSI.