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The Great Northern Railway (Ireland) SG and SG2 classes was one of the last designs of Charles Clifford. They were primarily intended for goods work, but the increased wheel diameter enabled effective passenger duties, managing heavy excursion trains with ease and speed. Beyer, Peacock and Company built the first two batches in 1913 and 1915 and the 1924-25 batch were built by Nasmyth, Wilson and Company. ==Design== They were the first GNR(I) designs to be fitted with Schmidt superheaters and piston valves, the SG class having a re-designed motion with rocker arms as well as the first to have wheels instead of . Engines were originally built with flush riveted smokeboxes. After the first major overhaul, domed rivets were used. These locomotives originally ran with flared tenders, but at a later date straight sided tenders were also used. When first brought into service, the five SG’s were originally numbered 137, 138, 37, 40 and 41. The last three were renumbered 47, 48, 49 and the whole series was finally renumbered 175, 176, 177, 178, 179. 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「GNRI Class SG」の詳細全文を読む スポンサード リンク
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