7mm Scale - 0 Gauge.  Diesel shunting locomotive, etched brass kit build.
BR(WR) built 5 0-6-0 diesel electric shunters for PW work. PWM650 was the prototype which is different from the others. Mercian Models kit portrays numbers 651-654.
Bonnet Frame.
Footplate
Cab.
Motor and Frames.
Loose Fitting.