The average horsepower of new tractors in the 1920s was just 25hp, but it’s now nearing 160hp. Michael Williams takes a look at the 11 most powerful tractors built over the last 100 years Twin City 60-90 (1913) 90hp In the early 1900s, American and Canadian farmers were bringing large areas of prairie land into cultivation for the first time. Big power was the fashion and the Twin City 60-90 model enjoyed a brief spell at the top of the […]