Radio Tractor No. 3 on White Chassis
|Place of origin||United States|
|Used by||US Army|
|Wars||World War I|
|Manufacturer||FWD, White Motor Company|
|Weight||1 1/2 ton|
The Radio tractor was a mobile Signal Corps Radio used by the U.S. Army for ground communications before and during World War I. Prior to World War I, trucks were referred to as "tractors", and there were also telegraph tractors, and telephone tractors.
Very little information exists for these trucks, as most of the components were built before standardization. They first made their debut on the Mexican border in a radio intercept role, and later during World War I, some sets may have been reconfigured for RDF and other uses.
At least 3 variants are known:
- Radio Tractor No. 1
- Radio Tractor No. 2 (Four Wheel Drive)(Jeffery Quad), Unknown radio set
- Radio Tractor No. 3 (White Motor Company), SCR-50 radio set
The No.3 truck was also accompanied by a tender "Maintenance truck No. 5" later renumbered as K-5.
- Signal Corps Storage Catalog 
- Annual Report 1919  page 249
- 1918 Military Signal Corps manual 
- New York Times 1915 
- Electrical world vol. 66 
- The Wireless Age 
- Automobile journal Vol. 39 
- http://www.gordon.army.mil/ocos/museum/equipment.asp scr and bc lists