A steam tractor is a tractor powered by a steam engine which is used for pulling.
Case steam tractor
Steam Tractor at the Henry Ford Museum
A 1905 Best steam tractor (manufactured in California).
The drive belt: used to transfer power from a portable engine to a threshing machine
The history of steam road vehicles comprises the development of vehicles powered by a steam engine for use on land and independent of rails, whether for conventional road use, such as the steam car and steam waggon, or for agricultural or heavy haulage work, such as the traction engine.
Murdoch's model steam carriage of 1784, now in Thinktank, Birmingham Science Museum
Steam carriage by Verbiest of 1679
Cugnot's "Fardier à vapeur" ("Steam wagon") of 1769
A replica of Trevithick's 1801 road locomotive Puffing Devil