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 drive is a must-have feature on medium- and high-horsepower tractors but it took more than 60 years for the farming industry to decide it was a good idea. The first farm vehicle with four-wheel drive was probably a Rubicon steam engine built in the USA in about 1886 […]