Duplex Steam Engines duplex Drive locomotives.

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The duplex corliss model steam engine by john v mcdivittIndustrial history: prr's duplex engines s1 (6-4-4-6) and t1 (4-4-4-4) Pennsylvania railroad t1 class duplex #6111 sometime in july of 1943Prr s-1 duplex top speed 127mph to 156mph.

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Pennsylvania railroad"duplex drive" steam locomotives (usa): history & photos Industrial history: prr's duplex engines s1 (6-4-4-6) and t1 (4-4-4-4)Prr steam locomotives class q1 duplex (4-6-4-4).

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