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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.
They were the first GNR designs to be fitted with Schmidtsuperheaters and 8-inch (203 mm) piston valves, the SG class having a re-designed motion with rocker arms as well as the first to have 5 ft 1 in (1.549 m) wheels instead of 4 ft 7 in (1.397 m).
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 3,500 imperial gallons (16,000 L; 4,200 US gal) straight sided tenders were also used.
When first brought into service, the five SGs 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.
Differencesedit
The major difference was in the brake rods of which there were two inboard of the wheels. The earlier SO and 562 locomotives had four pull-rods, the outer ones being outside of the wheels.
The 1915 batch (Classified 52 and 502) had direct motion, without rocker arms, driving inclined piston valves, and Robinson superheater. The only external difference was that the shaft and reversing rod were a little higher which resulted in the rear of the left hand side sandbox rod being inclined upwards from the centre sandbox back to the firebox.
The Wakefield mechanical lubricator was mounted further back on the 502. These locomotives were also fitted with Ross pop safety valves as built. The 1913 batch had lever safety valves changed to Ross pop type after first major overhaul after 10 years.
CIÉ ownershipedit
On the break-up of the GNR in 1958, Córas Iompair Éireann took over a number of these locomotives for a period of five years up to the end of steam on CIÉ. They were used particularly on the ex-Dublin and South Eastern Railway services to Wexford and Rosslare. CIÉ retained the GNR numbers, with suffix N except in the case of No.19, also ‘CIE’ was stencilled on the locomotive buffer beams. After withdrawal, some locomotives, including 15N, 179N, and 181N were kept in reserve by CIÉ, some until 1965.
The SG Class is currently available as a 00 gauge etched-brass kit from Studio Scale Models. It includes transfers, brass etches, most nameplates and cast white metal parts.
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This article relies largely or entirely on a single source Relevant discussion may be found on the talk page Please help improve this article by introducing citations to additional sources Find sources GNRI Class SG news newspapers books scholar JSTOR December 2014 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 GNR Class SGType and originPower typeSteamDesignerCharles GiffordBuilderBeyer Peacock amp Company Nasmyth Wilson amp CompanySerial numberBP 5633 5637 5896 5900NW 1428 1432Build date1913 1915 1924 1925Total producedSG 5SG2 10SpecificationsConfiguration Whyte0 6 0 UICC h2Gauge5 ft 3 in 1 600 mm Driver dia 5 ft 1 in 1 549 m SuperheaterSchmidtCylindersTwo insideCylinder size19 in 26 in 483 mm 660 mm Valve type8 inch 203 mm piston valvesCareerOperatorsGreat Northern RailwayUlster Transport AuthorityCIEWithdrawn1959 1965DispositionAll scrappedBeyer Peacock amp Company built the first two batches in 1913 and 1915 and the 1924 25 batch were built by Nasmyth Wilson amp Company Contents 1 Design 2 Differences 3 CIE ownership 4 Model 5 References 6 Further readingDesign editThey were the first GNR designs to be fitted with Schmidt superheaters and 8 inch 203 mm piston valves the SG class having a re designed motion with rocker arms as well as the first to have 5 ft 1 in 1 549 m wheels instead of 4 ft 7 in 1 397 m 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 3 500 imperial gallons 16 000 L 4 200 US gal straight sided tenders were also used When first brought into service the five SGs 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 Differences editThe major difference was in the brake rods of which there were two inboard of the wheels The earlier SO and 562 locomotives had four pull rods the outer ones being outside of the wheels The 1915 batch Classified 52 and 502 had direct motion without rocker arms driving inclined piston valves and Robinson superheater The only external difference was that the shaft and reversing rod were a little higher which resulted in the rear of the left hand side sandbox rod being inclined upwards from the centre sandbox back to the firebox The Wakefield mechanical lubricator was mounted further back on the 502 These locomotives were also fitted with Ross pop safety valves as built The 1913 batch had lever safety valves changed to Ross pop type after first major overhaul after 10 years CIE ownership editOn the break up of the GNR in 1958 Coras Iompair Eireann took over a number of these locomotives for a period of five years up to the end of steam on CIE They were used particularly on the ex Dublin and South Eastern Railway services to Wexford and Rosslare CIE retained the GNR numbers with suffix N except in the case of No 19 also CIE was stencilled on the locomotive buffer beams After withdrawal some locomotives including 15N 179N and 181N were kept in reserve by CIE some until 1965 Roster Class Manufacturer Serial No Date GNR No 1958 Owner 1958 No Withdrawn NotesSG Beyer Peacock amp Company 5633 1913 37 CIE 177N 1963 Renumbered 47 in 1913 and 177 later the same yearSG Beyer Peacock amp Company 5634 1913 40 CIE 178N 1961 Renumbered 48 in 1913 and 178 later the same yearSG Beyer Peacock amp Company 5635 1913 41 CIE 179N 1963 Renumbered 49 in 1913 and 179 later the same yearSG Beyer Peacock amp Company 5636 1913 137 UTA 43 1965 Renumbered 175 in 1913SG Beyer Peacock amp Company 5637 1913 138 UTA 44 1965 Renumbered 176 in 1913SG2 Beyer Peacock amp Company 5896 1915 180 CIE 180N 1961SG2 Beyer Peacock amp Company 5897 1915 181 CIE 181N 1963SG2 Beyer Peacock amp Company 5898 1915 182 UTA 41 1963SG2 Beyer Peacock amp Company 5899 1915 183 UTA 42 1961SG2 Beyer Peacock amp Company 5900 1915 184 CIE 184N 1963SG2 Nasmyth Wilson amp Company 1428 1924 15 CIE 15N 1963SG2 Nasmyth Wilson amp Company 1431 1924 18 UTA 38 1965SG2 Nasmyth Wilson amp Company 1429 1925 16 UTA 39 1965SG2 Nasmyth Wilson amp Company 1430 1925 17 UTA 40 1961SG2 Nasmyth Wilson amp Company 1432 1925 19 CIE 1959Model editThe SG Class is currently available as a 00 gauge etched brass kit from Studio Scale Models It includes transfers brass etches most nameplates and cast white metal parts References editRowledge J W P 1993 Irish Steam Locomotive Register Stockport Merseyside Irish Traction Group ISBN 0 947773 33 9 Further reading editJohnston Norman 1999 Locomotives of the GNRI Newtownards Colourpoint Books ISBN 1 898392 48 X OCLC 43340833 OL 12248170M Retrieved from https en wikipedia org w index php title GNRI Class SG amp oldid 1161807143, wikipedia, wiki, book, books, library,
