Duplex Steam Engines
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Industrial History: PRR's Duplex Engines S1 (6-4-4-6) and T1 (4-4-4-4)
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"duplex drive" steam locomotives (usa): history & photosThe t1 duplex, one of the fastest steam engines ever built with reports Great savings on lionel, mth, atlas-o & more..
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Industrial History: PRR's Duplex Engines S1 (6-4-4-6) and T1 (4-4-4-4)
SOUTHWORTH ENGINES DUPLEX STEAM BOILER FEED PUMP - YouTube
CLARKE Duplex Workshop Steam Engine - PRESTON SERVICES
Duplex Drive Locomotive
Steam Locomotive Classes and Names
Duplex Boiler Feed Pump - PRESTON SERVICES
Duplex Factory Steam Engine | Home Model Engine Machinist Forum