M-10001 By Brian Schmidt | July 23, 2021 | Last updated on August 7, 2025 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates M-10001 In the late 1930s, the Union Pacific’s streamliner M-10001 is serviced between runs in Chicago; although dirty, the streamliner stands out from older steel and wood cars in the yard. Alexander Maxwell photo