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Great Southern & Western Railway Class 90
Type and origin Power type Steam Builder Inchicore Works Build date 1875, 1890 Total produced 4
Specifications Configuration: ​  • Whyte 0-6-0T  • UIC C t Gauge 5 ft 3 in (1,600 mm) Driver dia. 3 ft8+1⁄2 in (1.130 m) Axle load 7 long tons 18 cwt (17,700 lb or 8 t) Loco weight 23 long tons 8 cwt (52,400 lb or 23.8 t) Fuel type Coal Firebox: ​  • Grate area 10 sq ft (0.93 m2) Boiler pressure 150 psi (1.03 MPa) Heating surface: ​  • Firebox 52 sq ft (4.8 m2)  • Tubes 310 sq ft (29 m2) Cylinders Two, inside Cylinder size 10 in × 18 in (254 mm × 457 mm)
Performance figures Tractive effort 5,160 lbf (22.95 kN)
Career Operators GW&SR →GSR →CIÉ Class GS&WR: 90 GSR/CIÉ: 90 or J30 Locale Ireland Withdrawn 1930–1959 Preserved No. 90 Disposition One preserved, threescrapped

TheGreat Southern and Western RailwayClass 90 is a class of0-6-0Tsteam locomotive. They were one of the smallest steam locomotives to be inherited by theCIÉ on its formation.

In 1875Inchicore Works outshopped tworailmotors, steam locomotives with a carriage on the same chassis to work theCastleisland and Gortatlea Light Railway. Both railmotors were rebuilt (the first in 1890) removing the carriage portion and leaving the locomotive as a small and light0-6-0T. The two examples were numbered90 and100 and were put to work in theCork area. Unusually, the centre driving wheels were flangeless giving very good working over tight radius tracks. They regularly shunted along the quayside at Cork and worked the car trains from the Ford works to Rocksavage yard. In the summer months both locomotives were coupled together to work the excursion trains on the lightly laidTimoleague and Courtmacsherry Light Railway.

In 1890 the class was enlarged with Inchicore building two further examples for use on the Fermoy to Mitchelstown branch and two for the Kingsbridge toInchicore branch, which they worked until 1945.Several detail changes were made over the years. One of the most noticeable was the replacement of the original chimney (which had a pronounced taper from base to apex), being replaced with a parallel version with a distinct lip.

• Driving Wheels:3 ft8+1⁄2 in (1.130 m) (10 spokes), centre wheels flangeless.
• Cylinders: (2) 12 in × 18 in (305 mm × 457 mm)
• Boiler Pressure: 150 psi (1.03 MPa)
• Weight: 22 long tons 9 cwt (50,300 lb or 22.8 t)

As locomotives they were painted in dark green with red, black and light green (later black and white) lining, with numbers on buffer beams in yellow, shaded white and blue. The tank sides carried number plates with polished numbers against a paint black background on the plate. After about 1915 they became all-over plain grey, initially with numberplates painted on in grey, but latterly under CIÉ these were removed and large pale yellow painted numerals applied instead. No. 90, the last survivor, appears to have been repainted black in its last few years in use, approximately 1957–60.

One example, No. 90, was preserved for many years as a static exhibit atMallow railway station. This was painted in the green livery, as detailed above, but a cast number plate with black numerals on a silver background (not original) has replaced the painted numbers. After a brief spell in the CIÉ workshops at Inchicore No. 90 was removed to the workshops of theRailway Preservation Society of Ireland at Whitehead in 2005, to undergo restoration. The locomotive was back in steam by Sunday 30 September 2007 and is owned by theDownpatrick Railway Museum, where it is currently under restoration.

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• Clements, Jeremy & McMahon, Michael (2008).Locomotives of the GSR. Newtownards:Colourpoint Books. p. 73.ISBN 978-1-906578-26-8.

• Number 90Archived 26 December 2007 at theWayback Machine
• DownpatrickArchived 14 October 2006 at theWayback Machine

• 0-6-0T locomotives
• C n2t locomotives
• Steam locomotives of Ireland
• Steam locomotives of Northern Ireland
• Railway locomotives introduced in 1875
• 5 ft 3 in gauge locomotives

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