MGWR Class 1
The MGWR Class 1 were supplied by Thomas Grendon and Company from April 1847 with ''Dunsandle'' performing the trials and opening run. These engines were a replacement for a cancelled order from J & R Mallet of Seville Ironworks Dublin and arrived before the earlier order for MGWR Class 2 from William Fairbairn & Sons, Fairbairn. Juno was later converted into a 2-2-2T tank locomotive.MGWR Class 2
William Fairbairn & Sons, Fairbairn supplied 6 engines in response to a quote in 1846, the engines being delivered from June 1847. They seem to have accumulated less average mileages than MGWR Class 1 and were withdrawn within 10 years apart from ''Orion'' which was converted to a tank engine in 1852.MGWR Class 3
The six MGWR Class 3 locomotives were also supplied by William Fairbairn & Sons, Fairbairn in 1848. Built to a different design they had a longer service life than the Fairbairn Class 2.MGWR Class 4
The MGWR Class 4 from William Fairbairn & Sons, Fairbairn were 2-2-2 Tank locomotive#Well tank, Well Tank locomotives ordered for the MGWR's Galway extension in 1851. One of the original order of 4 was believed to have been sent to Brazil. They had a long service life of nearly 50 years with some remaining in use as stationary boilers up to 1906.MGWR Class 5
With the exception of Class 13 all subsequent locomotive builds for the MGWR were of engines with the driving wheels connected by Coupling rod, coupling rods for better adhesion. The MGWR Class 5 engines were themselves rebuilt as 2-4-0s beforce withdrawal and renumbered in the range 88-93.MGWR Class 13
The final set of six 2-2-2 passenger locomotives for the MGWR designated Class 13 built by R and W Hawthorn, R & W Hawthorn of Leith, Scotland. They had double-sandwich frames, outside springs and cylinders. Their driving wheels at were the largest of any MGWR 2-2-2 locomotive. They were renumbered 43-48 between 1871 and 1873 switching the number range with MGWR Class 12 so all passenger engines could be brought into the number range 1 to 48.} Their final years saw them displaced from main line to branch services.Notes
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* * {{Ireland Steam Locomotives 2-2-2 locomotives 5 ft 3 in gauge locomotives Railway locomotives introduced in 1847 Midland Great Western Railway locomotives, 01 Scrapped locomotives Thomas Grendon and Company locomotives Steam locomotives of Ireland