On drivers 31,000 pounds. On truck 4,000 " ------ Total weight of engine, about 35,000 " LOAD. IN ADDITION TO ENGINE AND TENDER. On a level 730 gross tons. " 20 ft. grade 340 " " " 40 " 220 " " " 60 " 160 " " " 80 " 120 " " " 100 " 100 " " Engines of this class can be adapted to a gauge of 3 feet or upward. DIVISION VIII. NARROW-GAUGE FREIGHT LOCOMOTIVES. CLASS 14 D. General Design Illustrated by Print on Page 128. CYLINDERS. Diameter of cylinders 12 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 15 ft. 4 inches. Rigid " 9 ft. 4 inches. TENDER. ON FOUR OR SIX WHEELS. Capacity of tank 900 gallons. WEIGHT OF ENGINE IN WORKING ORDER. On drivers 36,000 pounds. On truck 4,000 " ------ Total weight of engine, about 40,000 " LOAD. IN ADDITION TO ENGINE AND TENDER. On a level 870 gross tons. " 20 ft. grade 405 " " " 40 " 255 " " " 60 " 185 " " " 80 " 140 " " " 100 " 110 " " Engines of this class can be adapted to a gauge of 3 feet or upward. GENERAL SPECIFICATION. The following general specification of an ordinary freight or passenger locomotive is given to show principal features of construction. BOILER.