a train of sleds and other vehicles mounted on runners, the whole procession drawn by a tractor with caterpillar treads.
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British Dictionary definitions for cat-train
Canadian a train of sleds, cabooses, etc, pulled by a caterpillar tractor, used chiefly in the north during winter to transport freight
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012