Crawler with 3-, 4- or 5-roller tracks.
S/n 60001 was the first Model 40C, built November 4, 1952, with 3-track rollers.
S/n 62263 was the last Model 40C with 3 rollers, built June 1,1953.
S/n 62264 was the first Model 40C with 4 rollers, built July 16, 1953; 5 rollers also available.
S/n 71689 was the last Model 40C, built October 17,1955.
Standard.
Serial number 60001 was the first Model 40S, built January 9, 1953.
Serial number 71814 was the last Model 40S, built October 17,1955.
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