On a level 480 gross tons. " 20 ft. grade 225 " " " 40 " 140 " " " 60 " 105 " " " 80 " 75 " " " 100 " 60 " " Engines of this class can be adapted to a gauge of 3 feet or upward. DIVISION VII. NARROW-GAUGE PASSENGER AND FREIGHT LOCOMOTIVES. CLASS 9-1/2 C. General Design Illustrated by Print on Page 124. CYLINDERS. Diameter of cylinders 10 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 12 ft. 4-1/2 inches. Rigid " 6 ft. 6 inches. TENDER. ON FOUR OR SIX WHEELS. Capacity of tank 600 gallons. WEIGHT OF ENGINE IN WORKING ORDER. On drivers 25,000 pounds. On pony truck 5,000 " ------ Total weight of engine, about 30,000 " LOAD. IN ADDITION TO ENGINE AND TENDER. On a level 605 gross tons. " 20 ft. grade 285 " " " 40 " 175 " " " 60 " 125 " " " 80 " 95 " " " 100 " 75 " " Engines of this class can be adapted to a gauge of 3 feet or upward. [Illustration: Locomotive.] DIVISION VIII. NARROW-GAUGE FREIGHT LOCOMOTIVES. CLASS 12 D. General Design Illustrated by Print on Page 128. CYLINDERS. Diameter of cylinders 11 inches. Length of stroke 16 " DRIVING-WHEELS. Diameter of drivers 36 inches. TRUCK. TWO-WHEELED, WITH SWING BOLSTER AND RADIUS-BAR. Diameter of wheels 24 inches. WHEEL-BASE. Total wheel-base 14 ft. 3 inches. Rigid " 8 ft. 7 inches. TENDER. ON FOUR OR SIX WHEELS. Capacity of tank 750 gallons. WEIGHT OF ENGINE IN WORKING ORDER.