6×4
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A 6×4 or six-by-four is a vehicle with three axles, with a drivetrain delivering power to wheels at the ends of two of them. It is a form of four-wheel drive but not one of all-wheel drive.
Typical American 6×4 tractor unit
1937 military lorry off-road
TACR2 airfield fire engine
Albion CX22S
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The Albion CX22S was a heavy artillery tractor used by the British Army during World War II.
Albion CX22S heavy artillery tractor