| GNR(I) class JT | |
| Powertype: | Steam |
| Designer: | J. C. Park |
| Builder: | Dundalk Works |
| Builddate: | 1895–1902 |
| Totalproduction: | 6 |
| Uicclass: | 1′B1 n2t |
| Driverdiameter: | 5feet |
| Boilerpressure: | 140- |
| Cylindercount: | Two, inside |
| Cylindersize: | 16- bore 220NaN0 stroke |
| Operator: | GNR(I) → CIÉ |
| Operatorclass: | GNR(I): JT |
| Fleetnumbers: | 90, 93, 94, 95, 13 (→91), 14 (→92) |
| Withdrawndate: | 1955–1963 |
| Preservedunits: | No. 93 |
| Disposition: | One preserved, remainder scrapped |
The Great Northern Railway (Ireland) JT class comprised six 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 Most were withdrawn shortly after 1955 between 1955 and 1957 but one remained passed to Córas Iompair Éireann (CIÉ) and remained in service until 1963.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 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 Most were withdrawn between 1955 and 1957, but No. 91 (ex No. 13 Tulip) passed to Córas Iompair Éireann (CIÉ), and lasted until 1963.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 4feet boilers and standard 16.5x cylinders.
| Name | Manufacturer | Serial number | Date made | Boiler pressure | Cylinder bore | Date withdrawn | Notes | |||
| 93 | Sutton | Dundalk Works | 16 | 1895 | 140 psi | 160NaN0 | 1955 | align=left | ||
| 94 | Howth | Dundalk Works | 17 | 1896 | 140 psi | 160NaN0 | 1956 | align=left | ||
| 90 | Aster | Dundalk Works | 18 | 1898 | 160 psi | 170NaN0 | 1957 | align=left | ||
| 95 | Crocus | Dundalk Works | 20 | 1898 | 160 psi | NaN0NaN0 | 1955 | align=left | ||
| 13 | Tulip | Dundalk Works | 23 | 1902 | 175 psi | 170NaN0 | 1963 | align=left | Renumbered 91 in 1920; to CIÉ 91N | |
| 14 | Viola | Dundalk Works | 24 | 1902 | 175 psi | 170NaN0 | 1956 | align=left | Renumbered 92 in 1920 |
One member of the class, No. 93 is preserved at the Ulster Folk and Transport Museum at Cultra, County Down.