In the latest instalment of our series looking back over the history of machinery developments, Mike Williams charts the rise of four-wheel drive tractors and how they have become the norm. Four-wheel ...

With a weight of 70 tons and boasting 524 horsepower, the HD-41 crawler tractor made headlines as the largest built up to that time. Allis-Chalmers gave at-tendees a taste of things to come at the ...

Four-wheel-drive tractors with four equal-sized wheels started in 1912 with the Heer tractor. In 1930, Massey-Harris introduced its General Purpose model with 4-wheel drive and adequate clearance to ...

Tracked tractors are widely recognised as being the best means of putting serious horsepower to the ground. They’re expensive to buy new, yet here in the UK we still lap them up – nearly 200 are sold ...