New York Central J3a - 4-6-4 Hudson

Photo of the streamlined New York Central train the 20th Century Limited leaving Chicago's LaSalle Street station on a trial run June 9, 1938

Source:

https://commons.wikimedia.org/wiki/File:Test_run_of_streamlined_20th_Century_Limited_1938.jpg

Photo of New York Central J3a from Wikimedia Commons

License for this picture:

https://creativecommons.org/publicdomain/mark/1.0/