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Union Pacific Steam Engine # 9000 - Only one type of this 4-12-2 steam engine was built: the Union Pacific Railroad's 9000-series or class of locomotives. ALCO had obtained permission to use the conjugated valve gear invented by Sir Nigel Gresley. This system used two hinged levers connected to the outer cylinder's valves to operate the inner cylinder's valve. The 9000 class locomotives were the largest to use the Gresley gear feature.

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"Sir Nigel", old steam train in UK by Neil Cherry...... ooh, I touched this engine as it passed me as a young apprentice very slowly on a curve :-)

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Steam Engines ~ Three Gresley A4's are prepped for morning service and sit by the engine sheds 'warming through'. Taken in the yard at Grosmont on the North Yorkshire Moors Railway [NYMR] very early one summer morning by Paul Sutton.

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Number 4468 Mallard is a LNER Class A4 4-6-2 Pacific steam locomotive built in the 1930s and designed by Gresley. A wind-tunnel tested, aerodynamic body allowed it to reach speeds of over 100mph.

LNER A4 pacific locomotive 4498/60007 "Sir Nigel Gresley" in later British Railways livery and BR number.

von io9

Behold the Rusting Beauty of Abandoned Train Graveyards

Speed record holder 'Mallard' at York. www.haveit.cz

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LNER Class A4 4-6-2 Pacific engine number 4468 Mallard, still holds the record for being the fastest steam locomotive in the world (126 mph).

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Collins Street, Melbourne, with cable trams, c1900-10. Photograph courtesy State Library Victoria.

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Collins Street, Melbourne, with cable trams, c1900-10. Photograph courtesy State…

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