Museam at Campbell River - Steam Donkey
engine 10x12
Boiler: Around 44 inches in diameter and 92 inches in height
Drums (Spools): Around 16 inches in diameter by 25 inches in width

Scale Model Steam Donkey with Boiler
Scale Model Steam Donkey. The model weighs around 450 lbs. and measures 58" high x 28" wide x 60" long. Bronze castings include two engines and cross slides. Also included are two 6-inch diameter by 3/4-inch steel crank disks, bronze eccentric, cast iron piston and rings, and all moving parts for the engines. The two engines run on 25 lbs. of steam or air pressure. The bore is 1.75 inches with a 2-inch stroke. It also features a 10" x 24" boiler that is 3/8-inch thick with an injector, mechanical oiler for both engines, water pump, a pop off valve set at 100 lbs. and two 9-inch spool drums with oak clutches, braking system and ratchet-and-pawl. I will also include the hand forged logging tongs. Each spool has 250 ft. of stainless steel cable.

Steam donkey (Wikipedia)
Yarder (Wikipedia)

Hathitrust - AH&D catalog 106
also shows locomotive cranes