A giant American locomotive that handles 4,000 tons trains on the Northern Pacific Railroad
THE NEW 2-
THE American Locomotive Company recently completed at their works at Schenectady, N.Y., for service on the Northern Pacific Railway, a locomotive that is claimed to be the largest and heaviest yet built. This monster is of the single expansion “Mallett” articulated type, with a 2-
This locomotive rides the rails on 34 wheels, including 12 on the tender. The total weight of engine and tender is 1,118,000 lbs., of which 717,000 lb. is the weight of the engine and 401,000 lb. that of the tender. Of the engine weight, 553,000 lb. is on the drivers; 48,500 lb. on the front truck, and 115,500 lb. on the trailing truck.
All four cylinders have the same diameter and stroke, 26 in. by 32 in. and the boiler — claimed to be the largest locomotive steam boiler ever built — operates at a pressure of 250 lb. The driving wheels have a diameter of 63 in. The engine develops a tractive power at 75 per cent, cut-
The overall length, between couplers, of the engine and tender is 125 ft., or three times the length of a standard American freight car. The height from the top of the rail is 16 ft. 4 in.
As it was desired to use semi-
The unusual length of the grates, 22 ft. 3 in., made it necessary to provide some additional means of manipulating a rake in the firebox, otherwise than through the fire-
The tender has a capacity of 22,000 gallons of water and 27 tons of coal. The Coffin feedwater heater installed consists of two heaters welded together, so as to provide the same uniformity of steam passage as the single unit but with double its heat transfer capacity. Steam is admitted to the four cylinders by means of an American multiple throttle, which is power operated; and this is claimed to be the first installation of a power throttle device on a steam locomotive.
This new locomotive is in regular freight service over the 216 miles of Northern Pacific line from Mandan, North Dakota, to Glendive, Montana. This district has maximum grades of 1.1 per cent., the position and extent of the grades being such that double-
The locomotive described here was designed to draw a 4,000-