The locomotive and tender are 108 feet long, and weigh 835,000 pounds in operating condition. The fuel is bunker type C oil. A boiler pressure of 250 pounds per square inch is employed. The cylinder bore is 27 inches, the stroke 30. The eight drivers are 73 inches in diameter, and the driving wheelbase is 20 feet. The later streamlined 4-8-4’s of the Southern Pacific develop 5,500 horsepower at 55 miles an hour, and operate on a boiler pressure of 300 pounds per square inch. General Electric Locomotive, 1938 A nonoperable model (figure 78) of the first of six 2-C+C-2 streamlined electric locomotives built by the General Electric Co. for The New York, New Haven and Hartford Railroad Co. was made especially for the Museum collection (USNM 311880) by the builder of these locomotives. The model, constructed in the Bridgeport, Conn., plant of the General Electric Co. and presented to the Museum in 1940, is of plaster painted green and black, with gold trim. It is 31 inches long and has a gauge of 1¾ inches. The electric locomotives represented by this model were built in 1938 at the Erie, Pa., plant of the General Electric Co. for passenger service between New Haven and New York. Originally numbered from 0361 to 0366, they are now numbered from 360 to 365. [Illustration: Figure 78.—Model of General Electric locomotive, 1938.] On the New Haven tracks these 77-foot-long locomotives operate on 11,000-volt, single-phase, 25-cycle, alternating current obtained from an overhead trolley system. On the New York Central tracks they operate on 660-volt direct current obtained usually from a third rail, but occasionally from an overhead supply at some crossover switches. For this latter purpose a small auxiliary pantograph is used. Control equipment is, of course, provided for both types of power supply. The fully loaded weight is 433,200 pounds, of which 272,400 pounds is on the twelve 56-inch drivers. While operating on alternating current, the continuous tractive force is 24,100 pounds, and the continuously available horsepower 3,600. The maximum available horsepower from the six twin-armature, 12-pole motors is 7,600. Slightly different results are obtained while operating on direct current. The maximum safe speed is 93 miles an hour. American Locomotive Co. Hudson-Type Locomotive, 1938 Development of the original Hudson-type locomotives began in 1926 when the New York Central System decided it needed a new type of passenger locomotive to meet the demands of high-speed, long-distance runs. The type was named after the river along which it would run. In late 1937 and in 1938, 50 Hudsons of an improved design, built by the American Locomotive Co., were placed on the New York Central. These locomotives, Nos. 5405 to 5454, had larger boilers than their predecessors, had greater tractive force, and were fitted with roller bearings. In addition, Nos. 5445 to 5454 were streamlined.