Ride 'Em Cowboy (1936)

Fleeing from the Sheriff, Jess Burns hops on a passing train and right into the baggage car where hustler Chuck Morse is posing as a race car mechanic. Needing a driver for the big race, Chuck talks Jess into it and names him Speed. Having never driven a car and reluctant at first, Jess takes a dislike to his competing driver and sets out to win the race.