On a level 1375 gross tons. " 20 ft. grade 650 " " " 40 " 420 " " " 60 " 310 " " " 80 " 240 " " " 100 " 195 " " DIVISION VI. TANK SWITCHING ENGINES. CLASS 27-1/2 D. General Design Illustrated by Print on Page 120. CYLINDERS. Diameter of cylinders 16 inches. Length of stroke 22 " DRIVING-WHEELS. Diameter of drivers 44 to 48 inches. WHEEL-BASE. Total wheel-base 10 feet. Rigid " 10 " TANK. Capacity 900 gallons. WEIGHT OF ENGINE IN WORKING ORDER. Total weight of engine, about 66,000 pounds. LOAD. IN ADDITION TO WEIGHT OF ENGINE. On a level 1470 gross tons. " 20 ft. grade 700 " " " 40 " 455 " " " 60 " 335 " " " 80 " 260 " " " 100 " 210 " " [Illustration: Locomotive.] DIVISION VII. NARROW-GAUGE PASSENGER AND FREIGHT LOCOMOTIVES. CLASS 8-1/2 C. General Design Illustrated by Print on Page 124. CYLINDERS. Diameter of cylinders 9 inches. Length of stroke 16 " DRIVING-WHEELS. Diameter of drivers 36 to 40 inches. TRUCK. TWO-WHEELED, WITH SWING BOLSTER AND RADIUS-BAR. Diameter of wheels 24 inches. WHEEL-BASE. Total wheel-base 11 ft 11-1/2 inches. Rigid " 6 ft. 3 inches. TENDER. ON FOUR OR SIX WHEELS. Capacity of tank 500 gallons. WEIGHT OF ENGINE IN WORKING ORDER. On drivers 20,000 pounds. On truck 5,000 " ------ Total weight of engine, about 25,000 " LOAD. IN ADDITION TO ENGINE AND TENDER.