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}} The Pennsylvania Railroad's class H6, H6a, and H6b steam locomotives were of the 2-8-0 "Consolidation" freight type, the most numerous class on the railroad with 2032 units. The three sub-classes differed as follows:〔 In the 1920s, 699 H6a and H6b had superheaters added and cylinder size increased from 22” to 23” and reclassified to H6sa and H6sb. Class H6 were used throughout the system as mainline freight haulers, on local freights, and as switchers in yards. They were frequently seen double and triple heading long freight trains up the steep grades on the Pennsy.〔Westing, Fred. Pennsy Steam and Semaphores. Superior Publishing ISBN 0-517-36955-9〕 During the period when the PRR was building the H-6 class, the railroad had effective stock control of the B&O, and installed a cooperative president Leonor Loree. The B&O acquired from American Locomotive Co. a large group of identical locomotives, originally classed I-4, but later classified as B&O class E-24. The E-24 class had many variations, some being converted to switchers, superheated, and new valve chests. The E-24a was equivalent to the PRR H-6sb. On the B&O the E-24 class survived to the Diesel era. ==Survivors== PRR #2846, an H6sb built in 1905 by the Baldwin Locomotive Works, has been preserved by the Railroad Museum of Pennsylvania with two other examples of the H class. #2846 was added to the National Register of Historic Places in 1979 as Consolidation Freight Locomotive No. 2846. 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 H6」の詳細全文を読む スポンサード リンク
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