This is a Bateman Assault Bridge Carrier, an experimental tank-bridge-laying-combo based on the excellently-named ‘Medium Dragon’ Mk.1 artillery tractor that was trialled by the British Royal Engineers in 1926.
It’s one of the more obscure vehicles to appear here then, and it’s been recreated brilliantly by Tarix819 of Eurobricks in a colossal 1:8 scale.
Weighing almost 10kgs, Tarix’s creation features two coil-sprung tracks, each with its own mechanical tensioner and independently powered by an SBrick and three XL motors.
A working V8 engine lives within the armour, and a functioning searchlight is able to light up the obstacle ahead in need of crossing.
And cross an obstacle the Bateman can, as Tarix’s model can deploy the huge bridge mounted on the top of machine. The real Assault Bridge Carrier relied on hand-powered winches (which are also recreated here), but Tarix’s build utilises a Power Functions Medium Motor to complete the model’s suite of remote control functionality.
It’s a monumentally impressive piece of Lego engineering and you can see how Tarix has done it at the Eurobricks discussion form here, and via the brilliant video below.