M-10000

The Union Pacific Railroad's M-10000, delivered to the railroad on February 12, 1934, at a cost of $230,997, was the first internal combustion engine, lightweight streamlined express passenger train built in the United States. The M-10000 featured a turret cab, an inward-slanting Duralumin body with a nose formed of parabolic arches, and large nose air intakes on each side of the centerline. The prime mover was a 600 hp (450 kW) Winton 191-A V12 distillate engine. This engine design was unrelated to the later 201 or 201A Winton diesels. There were three cars: a driving, power and baggage car at the front; and two passenger cars. The 204 ft (62 m) long, 85-short-ton (77 t) train was fully articulated, with trucks shared between cars. The front truck carried one General Electric traction motor per axle, and was the only one powered. The train was painted in Armour Yellow with Leaf Brown roof and undersides. Later, the area around the front air intake was also painted yellow. Dividing lines of red separated the colors.

The sleeping car "Overland Trail" was constructed for M-10000 and included in the consist during its February - May 1934 publicity tour, but it was never used in regular service with that train; instead, because of M-10000's assignment as a day train the sleeper was mated with the next Streamliner, M-10001.

The M-10000 car design built upon the efforts of William Bushnell Stout, a pioneer of all-metal construction for airplanes who adapted metal fuselage design to the Railplane (not to be confused with the Bennie Railplane), a lightweight self-propelled railcar built by Pullman-Standard in 1932. The tapered car cross-section, lightweight tubular aluminum space frame construction, and Duralumin skin of the Railplane were carried over into the M-10000 design. Pullman engineer Martin P. Blomberg helped style the exterior of the M-10000 and the M-10001.

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