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The PRR S1 class steam locomotive (nicknamed "The Big Engine") was a single experimental locomotive, the longest and heaviest rigid frame reciprocating steam locomotive ever built. The streamlined Art Deco styled shell of the locomotive was designed by Raymond Loewy.〔 The S1 was the only locomotive ever built with a 6-4-4-6 wheel arrangement. It was a duplex locomotive, meaning that it had two pairs of cylinders, each driving two pairs of driving wheels. Unlike similar-looking articulated locomotive designs, the driven wheelbase of the S1 was rigid. The S1 was completed January 31, 1939 and was numbered 6100. At overall, engine and tender, the S1 was the longest reciprocating steam locomotive ever; it was too big for many PRR curves. Along with wheel slippage, this limited the S1's usefulness. No further S1 models were built as focus shifted to the T1 class. The last run for the S1 was in December 1945 and the engine was scrapped in 1949.〔 ==Construction history== In 1937 Pennsylvania Railroad officials decided to build a new passenger locomotive to replace its aging K4s locomotive. The PRR officials also hoped that the new S1 steam locomotive would have performance equal to their GG1 electric locomotive.〔 In a collaborative effort, the Pennsylvania Railroad, Baldwin Locomotive Works, the Lima Locomotive Works and the American Locomotive Company contributed to the experimental S1 design. The S1 was the largest passenger locomotive ever constructed, with an overall length of . At long and a weight of , the cast steel locomotive bed plate made by General Steel Castings was the largest single-piece casting ever made for a locomotive.〔 The boiler for the S1 was the largest built by the Pennsylvania Railroad, with of direct heating surface and 5001 in tubes and flues. The six-wheel leading and trailing trucks were added, as the locomotive was too heavy for four-wheel units. The streamlined Art Deco styled shell of the locomotive was designed by Raymond Loewy,〔〔 for which he received (U.S. Patent No. 2,128,490 ). The cost of an S1 was $669,780.00, equal to $ today.〔 To get enough steel between the crank and axle, the back end of each main rod was offset from the crank in the driver, so the big end made a circle while each siderod pin made a circle. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「PRR S1」の詳細全文を読む スポンサード リンク
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