Caterpillar D-7 Tractor — 1930s promo film !

winter and summer around the calendar and often Around the Clock Timber must be brought from Western Forest to supply giant Mills even after a blizzard there must be no delays roads must be opened quickly so logs can be brought from the woods and out they come dragged from their snowy bed by a diesel tractor to start the long journey to the mill it's a half mile to The Landing with mud every foot of the way but each D7 tractor in the fleet is averaging 45,000 board feet a day bunching and pans skitting to the railroad