MGWR Class J5

Infobox Locomotive
name = Midland Great Western 623 class
powertype = Steam


caption =
designer = Walter H. Morton
builder = MGWR Broadstone Works
builddate = 1921–1924
totalproduction = 23
whytetype = 0-6-0
railroad = Midland Great Western Railway
Great Southern Railways Córas Iompair Éireann
railroadclass = MGWR 623
GSR J5

The MGWR Class J5 is a class of 0-6-0 steam locomotives of the Midland Great Western Railway of Ireland which were designed and built between 1921 and 1924. The locomotives could be used to handle goods and also for passenger traffic.

History

The Midland Great Western Railway was looking to modernise its motive power fleet, and turned to their Chief Mechanical Engineer, Walter H. Morton, to design a locomotive which could be capable of handling goods, and if required, for local passenger traffic. The design from the Broadstone Drawing Office was for a six coupled (0-6-0) tender locomotive, and the first appearing from the works in 1921, the last in 1924.

This was the last complete class of locomotives designed and built at Broadstone before closure and transfer of work to Inchicore. The only other locomotives to follow from Broadstone were the first of the "kit - built" Woolwich Moguls before this was also transferred to Inchicore.

There was a total of 23 members of the class, which were originally known, as were most Irish classes, by the number of the first example, in this case 623. The class was designated as J5 under the system used by the Great Southern Railways (GSR) and passed to the Córas Iompair Éireann (CIÉ) on its formation in 1945. Examples of the class survived until c.1960, almost to the end of steam on the CIÉ.

Oil firing

In the severe winter of 1946 / 47 coal was in short supply and, with services disrupted, the CIÉ. took the decision to convert 97 locomotives to oil-burning, the main classes chosen for this being the various 2-6-0s and the 623s, although this was extended to some 4-6-0s. Locomotives which were converted to oil-burning had a white circle painted on the smokebox and tender sides. A supply of coal from America arrived in March 1947 but it took a further three months to build up stocks before normal services could be resumed.

Livery

On their first visit to the workshops following the 1925 amalgamation to form the GSR the class were repainted into the standard "dark battleship grey" colours of the new company. Buffer beams were vermilion. Following nationalisation, some locos acquired a livery of "CIÉ Green", lined out in black and white; the footplate and smokebox were black and buffer beams vermillion.

Towards the mid-1950s the livery became unlined black on some locomotives with vermillion buffer beams. The number was in large yellow numerals on the cab side and the , and was painted black with lining of a single red line. The loco was treated thus for working the Cork - Mallow - Waterford expresses. Diesels soon took over - so this was short lived livery.