Experiments on the Holt caterpillar tracks started in May 1915 at the Schneider plant with a 75-hp wheel-directed model and the 45-hp integral caterpillar Baby Holt, showing the superiority of the latter [REF].
The Lincolnshire firm Richard Hornsby & Sons had been developing the caterpillar tractor since 1902, and built an oil engine powered crawler to move lifeboats up a beach in 1908.