GSWR Classes 28 & 47
No. 74 at Rock of Cashel 1905
Type and origin Power type Steam Designer Alexander McDonnell Builder Inchicore Build date 1879—1887 Total produced 23
Specifications Configuration: ​  • Whyte 0-4-4BT Gauge 5 ft 3 in (1,600 mm) Driver dia. 5 ft 8+1⁄2 in (1,740 mm) Trailing dia. 3 ft 9 in (1,140 mm) Length 33 ft 6+1⁄2 in (10,224 mm) Loco weight 41.8 long tons (42.5 t) Water cap. 1,044 imp gal (4,750 L; 1,254 US gal) back 135 imp gal (610 L; 162 US gal) side Boiler pressure 150 lbf/in2 (1.03 MPa) Cylinders 2 Cylinder size 16 in × 20 in (406 mm × 508 mm)
Performance figures Tractive effort 9,530 lbf (42.39 kN)
Career Operators GS&WR GSR Class E3 (Inchicore) Power class S/ RT Number in class 20 (47) 4 (28) Numbers 28,40,47–51,70–83 Locale Ireland Withdrawn 1905—1945 Disposition All scrapped
Details refer to class 47 [1]: 65, 66

The Great Southern and Western Railway (GS&WR) Class 47 consisted of twenty 0-4-4BT locomotives designed by Alexander McDonnell and introduced from 1883. They were intended for branch lines around Cork and for Dublin—Kildare and Dublin-Kilkenny services.^{[1]: 65, 66}

Class 47 was preceded by four members of class 28 introduced from about 1879, these having a slightly longer wheelbase. Only one of class 28 remaining into GSR service when it was renumbered 40 and included in GSR Class 47. This was the 100th locomotive built under the Alexander McDonnell period and was temporarily numbered 100 when new.^{[1]: 65–66}

There is a detailed O Gauge model of engine 47 in the Fry model railway collection.^[1]: 380