Diameter of drivers 56 to 66 inches. TRUCK. FOUR-WHEELED CENTRE-BEARING TRUCK, WITH SWING BOLSTER. Diameter of wheels 24 to 30 inches. WHEEL-BASE. Total wheel-base 20 ft. 7-3/4 inches. Rigid " (distance between driving-wheel-centres) 7 ft. TENDER. ON TWO FOUR-WHEELED TRUCKS. Capacity of tank 1600 gallons. WEIGHT OF ENGINE IN WORKING ORDER. On drivers 35,000 pounds. On truck 20,000 " ------ Total weight of engine, about 55,000 " LOAD. IN ADDITION TO ENGINE AND TENDER. On a level 835 gross tons. " 20 ft. grade 380 " " " 40 " 240 " " " 60 " 170 " " " 80 " 125 " " " 100 " 100 " " [Illustration: Locomotive.] DIVISION I. ROAD LOCOMOTIVES FOR PASSENGER OR FREIGHT SERVICE. CLASS 24-1/2 C General Design Illustrated by Prints on Pages 56 and 60. CYLINDERS. Diameter of cylinders 15 inches. Length of stroke 22 or 24 inches. DRIVING-WHEELS. Diameter of drivers 56 to 66 inches. TRUCK. FOUR-WHEELED CENTRE-BEARING TRUCK, WITH SWING BOLSTER. Diameter of wheels 24 to 30 inches. WHEEL-BASE. Total wheel-base 21 ft. 3 inches. Rigid " (distance between driving-wheel-centres) 7 ft. 8 inches. TENDER. ON TWO FOUR-WHEELED TRUCKS. Capacity of tank 1800 gallons. WEIGHT OF ENGINE IN WORKING ORDER. On drivers 39,000 pounds. On truck 21,000 " ------ Total weight of engine, about 60,000 " LOAD. IN ADDITION TO WEIGHT OF ENGINE AND TENDER. On a level 930 gross tons. " 20 ft. grade 430 " " " 40 " 270 " " " 60 " 190 " " " 80 " 140 " " "100 " 110 " " DIVISION I. ROAD LOCOMOTIVES FOR PASSENGER OR FREIGHT SERVICE. CLASS 27-1/2 C. General Design Illustrated by Prints on Pages 56 and 60. CYLINDERS.