GNRI Class SG

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GNR(I) class SG
GNRI loco SG.gif
Type and origin
Power type Steam
Designer Charles Gifford
Builder Beyer, Peacock & Co.,
Nasmyth, Wilson and Company
Serial number BP: 5633–5637, 5896–5900
NW: 1428–1432
Build date 1913, 1915, 1924–1925
Total produced SG: 5
SG2: 10
Specifications
Configuration 0-6-0
UIC classification C h2
Gauge 5 ft 3 in (1,600 mm)
Driver diameter 5 ft 1 in (1.549 m)
Superheater type Schmidt
Cylinders Two, inside
Cylinder size 19 in × 26 in (483 mm × 660 mm)
Valve type 8-inch (203 mm) piston valves
Career
Operator(s) GNR(I)UTA & CIÉ
Withdrawn 1959–1965
Disposition All scrapped

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[edit]

They were the first GNR(I) 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 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.

Differences[edit]

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 ownership[edit]

On the break-up of the GNR(I) 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-DSER services to Wexford and Rosslare. CIÉ retained the GNR(I) 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(I) No. 1958 Owner 1958 No. Withdrawn Notes
SG Beyer, Peacock & Co. 5633 1913 37 CIÉ 177N 1963 Renumbered 47 in 1913 and 177 later the same year
SG Beyer, Peacock & Co. 5634 1913 40 CIÉ 178N 1961 Renumbered 48 in 1913 and 178 later the same year
SG Beyer, Peacock & Co. 5635 1913 41 CIÉ 179N 1963 Renumbered 49 in 1913 and 179 later the same year
SG Beyer, Peacock & Co. 5636 1913 137 UTA 43 1965 Renumbered 175 in 1913
SG Beyer, Peacock & Co. 5637 1913 138 UTA 44 1965 Renumbered 176 in 1913
SG2 Beyer, Peacock & Co. 5896 1915 180 CIÉ 180N 1961
SG2 Beyer, Peacock & Co. 5897 1915 181 CIÉ 181N 1963
SG2 Beyer, Peacock & Co. 5898 1915 182 UTA 41 1963
SG2 Beyer, Peacock & Co. 5899 1915 183 UTA 42 1961
SG2 Beyer, Peacock & Co. 5900 1915 184 CIÉ 184N 1963
SG2 Nasmyth, Wilson & Co. 1428 1924 15 CIÉ 15N 1963
SG2 Nasmyth, Wilson & Co. 1431 1924 18 UTA 38 1965
SG2 Nasmyth, Wilson & Co. 1429 1925 16 UTA 39 1965
SG2 Nasmyth, Wilson & Co. 1430 1925 17 UTA 40 1961
SG2 Nasmyth, Wilson & Co. 1432 1925 19 CIÉ 1959

Model[edit]

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.

See also[edit]

References[edit]