Sam Loyd's Engineer's Puzzle

The Puzzle:

Sam Loyd's Engineer's Puzzle
Big Jim, engineer of the Oval Express says: "We blew off a cylinder head an hour after leaving the station and had to continue the trip at three-fifths of the former speed, which brought us in two hours late. If the accident had occurred fifty miles farther on, the train would have arrived forty minutes sooner".

How long was the run between stations?


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