For 8RX four-track tractors used in potato, sugar beet and vegetable production, John Deere has added track spacing options, which include: 132-, 136-, 144- or 152-inch-wide track spacings. The ...

John Deere built more than 160,000 Model D tractors between 1932 and 1953, the longest tractor production run in John Deere's history. Many of the Model D tractors were built in Waterloo.