The Linn half-track

Holman Harry Linn came from Maine, first tried six-wheel drive, and worked with Alvin Lombard around 1907 before going his own way — flexible tracks where Lombard kept rigid ones. The improved petrol machine of 1916 is the one the design is remembered for.

The advantage was in the turn: rival machines lost drive when they steered, and a Linn did not. They hauled freight on Canadian power schemes and, from about 1920, ploughed snow. A 1920 example is recorded with a 45 hp Continental Red Seal, six miles an hour and sixteen-ton loads. The CATRUK of 1938, a convertible truck-tractor, did not survive the war, and the company closed in 1952.