In 1934 the Louis Marx and Company introduced a new line of Streamliners that were completely new and original to the Marx line. Now in ownership of the Girard facility, the Marx toy company would begin focusing it's attention on contemporary trains. The light yellowish tan and light yellow tin lithographed Union Pacific M10000 series would be the first, making an appearance along with Marx Joyline in the Sears Wishbook of 1934.
The wind-up sets usually came with three units. They were the engine, a coach and an observation car. Cars were coupled using an articulated metal pin system. When this train traveled around curves, the motion resembled the wiggle of a snake. Some came with an electric headlight, which was powered by a C cell battery that mounted in the engine compartment. The electric m10000 used a Joy Line motor slightly modified with a long one piece steel slide pickup assembly. The observation car was equipped with rear lights, but the coaches were never factory lighted, although some tail cars had a jewel taillight.
Other Marx M10000 trains included a 1935 khaki (sandy taupe) or some call it (olive-brown) with light yellow set and I have seen an olive green version too, a 1936 red and silver set and a 1937 green and creme set. At auction a Marx Union Pacific M10000 series set in good condition can sell for over $500.00.