GNRI Class JT
||This article's lead section may not adequately summarize key points of its contents. (February 2013)|
|Type and origin|
|Designer||J. C. Park|
|UIC classification||1′B1 n2t|
|Gauge||5 ft 3 in (1,600 mm)|
|Driver diameter||5 ft 7 in (1,702 mm)|
|Boiler pressure||140–175 psi (0.97–1.21 MPa)|
|Cylinder size||16–17 in (406–432 mm) bore
22 in (559 mm) stroke
|Operator(s)||GNR(I) → CIÉ|
|Number(s)||90, 93, 94, 95, 13 (→91), 14 (→92)|
|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 Most were withdrawn between 1955 and 1957, but No. 91 (ex No. 13 Tulip) passed to Córas Iompair Éireann (CIÉ), and lasted until 1963.
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. 
|93||Sutton||Dundalk Works||16||1895||140 psi||16 in (406 mm)||1955|
|94||Howth||Dundalk Works||17||1896||140 psi||16 in (406 mm)||1956|
|90||Aster||Dundalk Works||18||1898||160 psi||17 in (432 mm)||1957|
|95||Crocus||Dundalk Works||20||1898||160 psi||16 1⁄2 in (419 mm)||1955|
|13||Tulip||Dundalk Works||23||1902||175 psi||17 in (432 mm)||1963||Renumbered 91 in 1920; to CIÉ 91N|
|14||Viola||Dundalk Works||24||1902||175 psi||17 in (432 mm)||1956||Renumbered 91 in 1920|
One member of the class, No. 93 is preserved at the Ulster Folk and Transport Museum at Cultra, Co. Down.
- Rowledge, J. W. P. (1993). Irish Steam Locomotive Register. Stockport, Merseyside: Irish Traction Group. ISBN 0-947773-33-9.