General Design Illustrated by Print on Page 68. CYLINDERS. Diameter of cylinders 16 inches. Length of stroke 22 or 24 inches. DRIVING-WHEELS. REAR AND FRONT PAIRS WITH FLANGED TIRES 5-1/2 INCHES WIDE. MAIN PAIR WITH PLAIN TIRES 6 INCHES WIDE. Diameter of drivers 48 to 54 inches. TRUCK. FOUR-WHEELED CENTRE-BEARING TRUCK, WITH SWING BOLSTER. Diameter of wheels 24 to 26 inches. WHEEL-BASE. Total wheel-base 23 feet. Rigid " (distance between centres of rear and front drivers) 12 ft. 1 inch. TENDER. ON TWO FOUR-WHEELED TRUCKS. Capacity of tank 1600 gallons. WEIGHT OF ENGINE IN WORKING ORDER. On drivers 51,000 pounds. On truck 16,000 " ------ Total weight of engine, about 67,000 " LOAD. IN ADDITION TO ENGINE AND TENDER. On a level 1230 gross tons " 20 ft. grade 570 " " " 40 " 360 " " " 60 " 260 " " " 80 " 195 " " " 100 " 155 " " DIVISION II. TEN-WHEELED FREIGHT LOCOMOTIVES. CLASS 26-1/2 D. General Design Illustrated by Print on Page 68. CYLINDERS. Diameter of cylinders 17 inches. Length of stroke 22 or 24 inches. DRIVING-WHEELS. REAR AND FRONT PAIRS WITH FLANGED TIRES 5-1/2 INCHES WIDE. MAIN PAIR WITH PLAIN TIRES 6 INCHES WIDE. Diameter of drivers 48 to 54 inches. TRUCK. FOUR-WHEELED CENTRE-BEARING TRUCK, WITH SWING BOLSTER. Diameter of wheels 24 to 26 inches. WHEEL-BASE. Total wheel-base 23 ft. 2-3/4 inches. Rigid " (distance between centres of rear and front drivers) 12 ft. 8 inches. TENDER. ON TWO FOUR-WHEELED TRUCKS. Capacity of tank 1800 gallons. WEIGHT OF ENGINE IN WORKING ORDER. On drivers 54,000 pounds. On truck 18,000 " ------ Total weight of engine, about 72,000 " LOAD. IN ADDITION TO ENGINE AND TENDER.