Bosko and Bruno (1932) - Public Domain Cartoons

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Summary
Bosko and his dog Bruno are walking down the railroad tracks. Halfway across a trestle, they realize that a train is coming up fast behind them. They run as fast as they can and jump onto a a handcar, which is conveniently sitting on the tracks. Bruno accidentally gets his foot caught in the turnout. Bruno escapes and hide under a trapdoor in the tracks. Bosko didn't see this, and thinks Bruno is dead. When the train has passed, Bruno pops out and teases his master for crying. Bosko is mad at his pet's actions and chases him into a tunnel, but they soon hear another train coming up behind them. Fortunately, it turns out to be a cow lowing.

Now off the railroad tracks, Bosko and Bruno find some chicken tracks and follow them to a nearby coop. The two then try to steal a chicken so they can have some eggs, but a lawman chases them with a shotgun. They run from him and jump on top of a train. The boxcar they're on uncouples and rolls downhill and through a tunnel, where they find themselves now chasing the same cow from earlier.