NIR Class 450
|Northern Ireland Railways Class 450|
8459 passing the site of Barn Halt.
|Family name||BR Second Generation (Mark 3)|
|Number built||9 sets|
|Number scrapped||7 sets|
|Formation||3-car sets (DM-T-DT)|
|Fleet numbers||Originally: 451–459,
|Operator||Northern Ireland Railways|
|Line(s) served||At time of withdrawal:
|Maximum speed||75 mph (121 km/h)|
|Engine(s)||English Electric 4SRKT|
|Safety system(s)||AWS, TPWS|
|Track gauge||1,600 mm (5 ft 3 in)|
The Class 450 is a type of diesel multiple unit (DMU) formerly used by Northern Ireland Railways. They were affectionately nicknamed 'Thumpers' and 'Castles' (Also known as the Castle Class) by rail enthusiasts.
In the mid 1980s, Northern Ireland Railways was in the process of upgrading its rolling stock. Having already purchased three new locomotives, it then proceeded to purchase replacements for its Class 70 diesel multiple units. A total of nine three car trains were constructed by BREL between 1985 and 1987 intended to supplement the existing Class 80 DMUs then in service. The trains were constructed using underframes of existing Mark 1 coaching stock, altered to 1,600 mm (5 ft 3 in) and new Mark 3 bodyshells. Because of this, they bear a strong resemblance to the British Rail Class 150, British Rail Class 210 (based on), British Rail Class 317, British Rail Class 318 and British Rail Class 455, as they use Mark 3 bodyshells. These were combined with refurbished power units and traction motors from the withdrawn Class 70 units (there were only eight Class 70 units available to be salvaged, so the equipment for the ninth train came from a withdrawn Class 80 train, powercar 88).
The power cars of the Class 450 units are named after various Northern Irish castles.
The Class 450 operate along the same lines as the prototype Class 210 DMUs on the British network, in that they consist of a single power car containing the traction and generating equipment (numbered 45x), an intermediate trailer car (numbered 79x) and a driving trailer (numbered 78x) as permanently formed 3 car sets. An additional "8" has been added to the start of all the cars so that they can be used by Translink's computer system.
In 2005, the entire fleet underwent an extensive refurbishment to bring them up to a similar standard to the newly introduced Class 3000 units, enabling them to remain in service for at least another 5 to 7 years. This will take them up to the point where they are expected to become "life-expired."
The entire Class 450 fleet has now been withdrawn from service, following the arrival of enough Class 4000 units to displace the 450 units serving the Larne Line and Portrush branch. The status of individual units is in the table below.
|Number||Power Car Name||Status||Notes|
|8451||Belfast Castle||Scrapped||Cut up at York Road, scrapped in Ahoghill, April 2012|
|8452||Olderfleet Castle||Scrapped||Cut up at York Road, scrapped in Ahoghill, April 2012|
|8453||Moiry Castle||Scrapped||Cut up at Adelaide Depot, scrapped at Ahoghill, 21 May 2013|
|8454||Carrickfergus Castle||Scrapped||Cut up at Adelaide Depot, scrapped at Ahoghill, 13 May 2013|
|8455||Galgorm Castle||Stored||Currently stored at Ballymena.|
|8456||Gosford Castle||Scrapped||Cut up and scrapped in Ballymena, 1 May 2013.|
|8457||Bangor Castle||Scrapped||Cut up at Adelaide Depot, scrapped at Ahoghill, 20 May 2013|
|8458||Antrim Castle||Stored||Currently stored at York Road.|
|8459||Killyleagh Castle||Scrapped||Cut up at Adelaide Depot, scrapped at Ahoghill, 15 May 2013|
|September 2011||Units 8451 and 8452 withdrawn with camshaft failure.|
|January 2012||Units 8453 and 8457 withdrawn and moved to Bangor centre siding. Units 8454 and 8459 withdrawn and moved to Belfast Central parcels siding.|
|18 February 2012||Unit 8455 worked a MRSI farewell tour for the 450 Class, visiting areas such as Dundalk and Antrim.|
|2 March 2012||Unit 8458 works the last 450 Class passenger service with the 1810 service from Larne Town to Belfast Central.|
|March 2012||Units 8455 and 8456 moved to Ballymena railway yard, Unit 8458 moved to Belfast Central parcels siding. All three units remained in stock in case of an emergency requirement, but were not called upon.|
|April 2012||Units 8451 and 8452 cut up at York Road and scrapped at Ahoghill.|
|1 July 2012||All Class 450 units officially withdrawn from stock.|
|3 February 2013||Unit 458 moved from Belfast Central parcel siding to York Road|
|May 2013||Unit 456 Scrapped at Ballymena|
|12 May 2013||Units 454 and 459 moved from Belfast Central parcel siding to Adelaide Depot, and scrapped a few days later|
|19 May 2013||Units 453 and 457 moved from Bangor to Adelaide Depot, and scrapped a few days later|
At current, there is no major interest in the preservation of a Class 450 unit, although a nascent railway in South Bedfordshire has registered interest with Northern Ireland Railways.
Units 8455 and 8458 will remain to run the 2014 sandite train.
Originally they operated on suburban services on the Larne and Bangor Lines, occasionally serving the Newry Line as well, with occasional appearances on the Derry line.
With the arrival of the Class 3000 trains in 2003, the 450s still had to be retained, as the 3000s were only a like-for-like replacement of the old Class 80 units. By the year of their withdrawal, the Class 450 units had mostly been relegated to weekday services on the Larne Line and the Portrush Line shuttle, however at weekends there were enough Class 3000 trains to operate these services.
The gradual entry into service of the Class 4000 trains in 2012 saw the Class 450 units each displaced by a new Class 4000 unit as one became available, until they were all finally withdrawn.
Two Class 450 units will be retained as a sandite train, similar to the way an old Class 80 unit was retained as such until 2012. The two 450 units being retained are 455 and 458.
|Class||Operator||No. Built||Year Built||Cars per Set||Unit nos.|
|Class 450||Northern Ireland Railways||9||1985||3||8451 – 8459|
|Wikimedia Commons has media related to NIR Class 450.|