IIRC, there were two prop-shafts to two (single) rear axles rather than it being a tandem bogie with an inter-axle differential.
ALBION REIVER (LAD) Dropside Lorry
Corgi CC11607 ROAD TRANSPORT HERITAGE – THE GOLDER YEARS Series Die Cast Limited Edition – 3,100 produced
Scale 1:50 / O gauge, approximate size L 7 1/4”; W 2”.
http://www.notatoy.com/images/produc...e_richards.jpg
DDAD (Detroit) 2-strokes would quite happily (!) run backwards (especially if you botched a hill-start) but the throttle-control had no effect and, if not 'choked' with the emergency flap (that cut off the air-supply) they would run away until they burst. The first sign (apart from continued difficulty in hill-starting as the engine was running backwards) was the clouds of white smoke from the exhaust as the sump oil was sucked up and burned. Time to pull the big red T-handle or get out and run . . .