GNR(I) class JT
No. 93 at the Ulster Folk and Transport Museum
Type and origin Power type Steam Designer J. C. Park Builder Dundalk Works Build date 1895–1902 Total produced 6
Specifications Configuration: ​  • Whyte 2-4-2T  • UIC 1′B1 n2t Gauge 5 ft 3 in (1,600 mm) Driver dia. 5 ft 7 in (1,702 mm) Boiler pressure 140–175 psi (0.97–1.21 MPa) Cylinders Two, inside Cylinder size 16–17 in (406–432 mm) bore 22 in (559 mm) stroke
Career Operators GNR(I) → CIÉ Class GNR(I): JT Numbers 90, 93, 94, 95, 13 (→91), 14 (→92) Withdrawn 1955–1963 Preserved No. 93 Disposition One preserved, remainder scrapped

The Great Northern Railway (Ireland) JT class comprised six 2-4-2T locomotives, all built between 1895 and 1902 at their Dundalk Works. These were of a J. C. Park design, but introduced following his death. They were used on Dublin suburban services; then on branch lines, including operation of the Dundalk, Newry and Greenore Railway when taken over in 1933. Most were withdrawn shortly after 1955 between 1955 and 1957 but one remained passed to Córas Iompair Éireann (CIÉ) and remained in service until 1963.

The JT class comprised six 2-4-2T locomotives, all built between 1895 and 1902 at their Dundalk Works.^[1] These were of a J. C. Park design, but introduced following his death. They were used on Dublin suburban services; then on branch lines, including operation of the Dundalk, Newry and Greenore Railway when taken over in 1933. Most were withdrawn between 1955 and 1957, but No. 91 (ex No. 13 Tulip) passed to Córas Iompair Éireann (CIÉ), and lasted until 1963.^{[citation needed]}

They were subject to enlargement as batches were introduced, and rebuilt between 1917 and 1925 with improved 4-foot-2-inch (1.27 m) boilers and standard 16.5-by-22-inch (420 mm × 560 mm) cylinders. ^[2]

One member of the class, No. 93 is preserved at the Ulster Folk and Transport Museum at Cultra, County Down.