The John Deere A and B tractors are models that were produced by the company in the early 20th century. They are part of the company's "New Generation" series of tractors, which also included models such as the G, H, and M. The main difference between the John Deere A and B tractors is their size and power. The A was considered a small tractor and was designed for general farm use, while the B was considered a medium-sized tractor and was designed for more heavy-duty tasks such as plowing and cultivating. The John Deere A was produced from 1934 to 1952 and was powered by a two-cylinder gasoline engine, it featured a live power take-off and a live hydraulics system. It was available in a standard and a row-crop version. It was considered a versatile and reliable tractor that was well-suited for small farms. The John Deere B, on the other hand, was produced from 1935 to 1952, it was powered by a four-cylinder gasoline engine and featured a live power take-off and a live hydraulics system. it was available in a standard and a row-crop version, and it was considered a more powerful tractor that was well-suited for heavy-duty tasks such as plowing and cultivating. Both the A and B models were popular among farmers during their production period and are still considered classic tractors by collectors and enthusiasts.