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Great Southern & Western class 101 “Standard Goods”
Great Southern class J15
Ireland | 1866 | 111 produced
No. 186 with Belpaire firebox and superheater in June 2010 at Whitehead, Antrim
No. 186 with Belpaire firebox and superheater in June 2010 at Whitehead, Antrim

The most numerous class of Irish locomotives was a six-coupled goods locomotive, which was purchased 111 times over a period of 37 years. It wore class number 101 on the GS&WR and was designated class J15 on the Great Southern from 1925. Thanks to their low axle loads, they could also be used on branch lines, where they even pulled passenger trains.

Schematic drawing in original state
Schematic drawing in original state
Locomotive Magazine, January 1918

The design was by Alexander McDonnell, who was Locomotive Superintendent from 1864 to 1883. Most examples were built at GS&WR's Inchicore works, but a smaller number came from the UK by Beyer, Peacock & Co and Sharp, Stewart & Co. Some of the examples built at Inchicore used components of old 0-4-2 goods locomotives.

Schematic drawing in rebuilt state
Schematic drawing in rebuilt state
Locomotive Magazine, February 1918

All locomotives built up to 1881 had cylinders with a diameter of 17 inches and a stroke of 24 inches. The boiler was initially made of iron and could therefore only be operated at a pressure of 140 psi. Later boilers were steel and could be approved for 150 and later 160 psi. From 1882, cylinders with a diameter of 18 inches were installed.

An attempt to increase efficiency was number 165, built in 1888 with a compound engine with cylinders of 18 and 26 inches. As expected, this was more economical than its sisters, but could not muster the same pulling power. In 1896 it got the same cylinders as her sisters with simple steam expansion. The larger boilers that were installed in the last locomotives built in 1902 and 1903 were more successful. Later, a large number of locomotives were fitted with the same boiler. Many also got superheated boilers with Belpaire fireboxes

In heavy goods train use, the class 101 could pull up to 45 loaded cars. Limits were set only by the relatively low adhesive weight on wet tracks. In addition, the relatively small boiler did not have very much power reserve. After more powerful goods locomotives were procured at the turn of the century, the operational area of the class 101 shifted almost entirely to branch lines. Nevertheless, new locomotives were introduced in 1929 and 1934 with the classes 700 (J15a) and 710 (J15b), which were based directly on the class 101. The last copies were not retired until 1963.

Variant17 inch18 inchNo. 165 compound
ManufacturerInchicore, Beyer, Peacock & Co., Sharp, Stewart & Co.Inchicore
Axle config0-6-0 (Six-coupled) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase15 ft 6 in
Fixed wheelbase15 ft 6 in
Service weight72,128 lbs77,280 lbs
Adhesive weight72,128 lbs77,280 lbs
Total weight135,968 lbs141,120 lbs
Axle load26,208 lbs29,344 lbs
Water capacity2,239 us gal
Fuel capacity8,960 lbs (coal)
Power sourcesteam
Estimated power475 hp (354 kW)450 hp (336 kW)
Optimal speed23 mph17 mph26 mph
Starting effort13,367 lbf17,126 lbf10,854 lbf
with start valve13,025 lbf
Power Plant
Driver diameter61.8 in
Boiler pressure140 psi160 psi150 psi
Expansion typesimplecompound
Cylinderstwo, 17 x 24 intwo, 18 x 24 intwo, HP: 18 x 24 in
and LP: 26 x 24 in
Grate area17.5 sq ft
Firebox area96 sq ft
Tube heating area856 sq ft764 sq ft
Evaporative heating area952 sq ft860 sq ft
Total heating area952 sq ft860 sq ft
Calculated Values
steam locomotive
Alexander McDonnell
last changed: 06/2022

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