CAF Class 4000

Overview and details
The CAF Class 4000 is a Diesel Multiple Unit manufactured by train producers CAF for NI Railways as the result of aging trains like the Class 450 and 80 Class and as a result of debates from the Northern Ireland Assembly to improve the rail network. As a result of this, Translink NI Railways bid £137 million pounds for the production of 20 3 car 4000 units (which effectively comes to £2.283 Million pounds per car) with the invitation to tender going to CAF in March 2009. The first 4000 arrived in Beflast Docks in March 2011 receiving testing and the 4000 fleet entered service in September 2011. In December 2018, NI Railways ordered 21 more cars to be used on 7 4000 sets to extend them to 6 car sets at a cost of £50 million pounds. In October 2019, the old 4000 V1 was replaced by the new, more heavily detailed and shaped 4000 V2. This comes with a more realistic interior and cab compared to the previous version and has utilsed a newer anti derail system which nearly eliminates sudden/unexpected/unintended derailments altogether.

Trivia

 * 4000s and 3000s share similarities, inside and outside with merely the same cabs. There are however minor differences with the cab back wall being dark blue and the fuse box is not in the same place as it is on the 4000. 3000s also have a different seating arrangement, engine and their cab also has a additional driver log on display.
 * The door alarm of a 4000 is different to the door alarms of a 3000.
 * The CAF 4000 has a very distinct engine noise, and has the same engine as the 172s, but only sounds similar. However, the London Overground 172s sound the exact same if compared together with the 4000.
 * Unlike the 3000s, 4000s are not permitted past the border. This is due to none of the units having Irish radio equipment or CAWS installed.
 * This is the first train 1r1shOperator built for NI Railways and the first to enter service.