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GNR/LNER Gresley "J6" class 0-6-0 No. 64223. | At Peterborou… | Flickr

"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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Sir Nigel Gresley with his A4

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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1962 - ''Royal Lancer'' at York.. | GNR/LNER Gresley pacific… | Flickr

Some machines are just beautifully simple. The crankshaft (such as the kind you find on a steam engine) is one such example.

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Sir Nigel Gresley 60007 - Steam Trains

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GRESLEY A4 60032 GANNET KX. | Charlie Mercurius | Flickr

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

british steam locomotives - Google Search