Tractors
A central triangular rocker carrying two tear-drop runner blocks on axles, so the track followed the ground and both sides kept full power through a turn.
Marques
About 2,500 half-track haulers from Morris, New York between 1916 and 1952: freight on Canadian power schemes, and snow ploughing from about 1920.



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All 1 Linn marques by years in production, 1948 → today
A central triangular rocker carrying two tear-drop runner blocks on axles, so the track followed the ground and both sides kept full power through a turn.