The Allis Chalmers HD-16DP is an industrial crawler tractor produced from 1964 to 1970. It features a powerful 13.8L 6-cylinder diesel engine delivering 183 hp net, coupled with a 2-speed power shift transmission. Built in Springfield, Illinois, USA, it has a crawler drive with 20-inch tracks and an open operator station. The tractor weighs 35,700 lbs and is designed for heavy industrial applications.