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| Northern Ireland Railways 450 Class | |
|---|---|
 8458 departing City Hospital in 2009. | |
| In service | 1985–2012 |
| Manufacturer | British Rail Engineering Limited |
| Family name | BR Second Generation (Mark 2 and Mark 3) |
| Entered service | 1985–1987 |
| Scrapped | 2012–2017 |
| Number built | 9 sets |
| Number scrapped | 8 sets |
| Formation | 3-car sets (DM-T-DT) |
| Fleet numbers | Originally: 451–459, Now: 8451–8459 |
| Capacity | 184 seats |
| Operators | Northern Ireland Railways |
| Lines served | At time of withdrawal: Belfast-Larne Coleraine-Portrush Formerly: Belfast-Bangor Belfast-Newry |
| Specifications | |
| Maximum speed | 75 mph (121 km/h) |
| Prime mover(s) | English Electric 4SRKT |
| Safety system(s) | AWS, TPWS |
| Track gauge | 1,600 mm (5 ft 3 in) |
The 450 Class is a type of diesel multiple unit (DMU) passenger train formerly used by Northern Ireland Railways. They were affectionately nicknamed 'Thumpers' and 'Castles' (also known as the Castle Class) by rail enthusiasts.