Total wheel-base 22 ft. 5 inches. Rigid " (distance between centres of rear and front drivers) 15 ft. TENDER. ON TWO FOUR-WHEELED TRUCKS. Capacity of tank 2000 gallons. WEIGHT OF ENGINE IN WORKING ORDER. On drivers 66,000 pounds. On leading wheels 10,000 " ------ Total weight of engine, about 76,000 " LOAD. IN ADDITION TO ENGINE AND TENDER. On a level 1600 gross tons. " 20 ft. grade 740 " " " 40 " 470 " " " 60 " 340 " " " 80 " 260 " " " 100 " 205 " " ADDENDA. ANTHRACITE COAL BURNERS. For anthracite coal, a long and shallow fire-box is constructed, and the back driving-wheels are placed at the same distance from the main pair as the latter are from the front drivers. This reduces the rigid wheel-base to some extent, but retains the same weight on drivers. CURVING. The leading wheels having a swing bolster, and the middle pair of drivers having no flanges, the engine is guided by the truck and the front drivers, and is found to pass short curves without difficulty. TRACTIVE POWER. It will be seen that in engines of this pattern nearly all the weight of the machine is utilized for adhesion, only enough load being thrown on the leading wheels to steady the engine on the track. The tractive power of these engines is accordingly greater in comparison with their total weight than that of either the eight-wheeled C or the ten-wheeled D patterns, and they are, therefore, especially suited to working steep grades and hauling heavy loads at low speeds. STRAIGHT AND WAGON-TOP BOILERS. All the engines of this Division are built with wagon-top boilers or with straight boilers and two domes, as preferred. Where the latter form is made, the throttle-valve is placed in the forward dome. The wagon-top and straight boilers for the same class are so proportioned as to give equal steam space and the same number of flues in both forms of construction. [Illustration: Locomotive.] DIVISION IV. FREIGHT OR PUSHING ENGINES.--"CONSOLIDATION" PATTERN. CLASS 34 E. Illustrated by Print on Page 80. CYLINDERS. Diameter of cylinders 20 inches. Length of stroke 24 inches. DRIVING-WHEELS. REAR AND SECOND PAIRS WITH FLANGED TIRES 5-1/2 INCHES WIDE. FRONT AND MAIN PAIRS WITH PLAIN TIRES 6 INCHES WIDE. Diameter of drivers 48 inches.