M10000 streamliner

Union Pacific introduced the first diesel streamliner in February 1934. Named the M10000 it was built by Pullman-Standard and was a lightweight three unit train powered by a 600 horsepower distillate spark-ignition engine. The train carried 120 passenger seats in two cars. The seats had fold down trays and passengers were served meals from a cart, there were no dining or sleeping cars. The yellow and brown train operated till 1941, when the engine needed replacement after almost a million miles and it was deemed too expensive to repair.

The photo above shows crowds around the train when it made a special stop at the Hoover Dam where it was posed inside a section of the water-flow pipe.