While streetworker Mickey romances Minnie, Mickey's nephews Morty and Ferdie take control of his steamroller and it's full speed ahead on a very destructive ride.
A young man desperately in love with a nightclub singer sees an opportunity to spend some time alone with her when they're traveling through the Nevada gold country, and he takes the carburetor off her car and throws it in the river, stranding them there.
'Love and the First Railway' is what this movie's title would mean in English. This is one of those films that depicts fictional characters participating in an historic incident.
This is a minor variation on the story of the Boy Who Cried Wolf where Oswald the Lucky Rabbit tends a couple of lambs who tease him by crying 'Wolf! Wolf!' until the real article shows up.