Railroad Rhythm is a 1937 short animated film by Columbia Pictures starring the comic strip character Krazy Kat, and part of a long-running series of short films featuring the character.
While Krazy enjoys himself and even sings I've Been Working on the Railroad, the passengers are disoriented by the coaches tilting back and forth.
As Krazy continues to run his train, a villainous mutt, some miles ahead, ties a man and a woman, who are a couple, onto the track.
The cat and the porter (mimic of Stephin Fetchit) save a band leader and his girlfriend from death, receive as reward enough cash to buy a streamlined train.
"[3] Selected Motion Pictures (Jan 1, 1938): "Krazy Kat rescues his sweetheart from the villain in an old-time melodrama with a modern ending.