The Great Southern and Western Railway (GS&WR) Class 21 (Or perhaps more simply engine numbers 21 to 40) consisted of half of the initial order of 40 passenger locomotives ordered for the GS&WR and which entered service between approximately 1845 and 1847. A number were later rebuilt to 2-4-0 locomotives for goods work.

Engine No. 36, built in 1847, covered and is preserved at . There were suggestions it was able to achieve downhill on Ballybrophy bank but climbing out of Kingsbridge towards Inchicore on a wet day might require the fireman to walk alongside shovelling sand under the wheels to prevent slipping.

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