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Shenandoah (vicinity), Pennsylvania. A compressed air engine approaching with a train of cars in the Maple Hill mine. The…
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Shenandoah (vicinity), Pennsylvania. A compressed air engine approaching with a train of cars in the Maple Hill mine. The pipes beside the track carry eight hundred pounds and there are valves for refueling every quarter mile. Compressed air is piped down from the surface. Sourced from the Library of Congress.

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Shenandoah (vicinity), Pennsylvania. A compressed air engine approaching with a train of cars in the Maple Hill mine. The pipes beside the track carry eight hundred pounds and there are valves for refueling every quarter mile. Compressed air is piped down from the surface. Sourced from the Library of Congress.

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