in 2005. Two factory train for renewing overhead line equipment on the West Coast Mainline was ordered in 1999, and delivered in 2000. Each train-consist was made up of five separable autonomous units (four of which were single-ended MPVs); the entire train is fitted for multiple working allowing self powered transportation to a work site. In operation the train-consist splits into five sub-trains: the first unit is used to dismantle and recover previously installed wire; the second unit replaces catenary support wires ("droppers"), the third and fourth units install new wire and droppers, and the fifth unit is used for quality control – measuring and recording the new installation. To allow slow speed control the MPVs were fitted with hydrostatic drives. A Windhoff MPV was also used as the basis of a piling train – used to install catenary masts. The piling train including MPV mounted piling hammers (Fambo AB), and installation cranes (Hap, Palfinger). In 2011 a specialised factory train for overhead line installation was ordered – the initial use of the train was expected to be the electrification of the Great Western Main Line (c.2013). The train, named the 'High Output Plant System' train was completed by late 2013. The entire train consisted of a 23 vehicles designed to be split into five separate working sections: two piling sets, one with a vibrating piler, the other with a percussion piler; a concrete mixing set; a structure erection set; and a catenary installation set. In 2016, NI Railways had an MPV delivered to undertake sandite duties. See also M250 series, high speed electric multiple unit for containerised freight (Japan) References Literature also External links , images of INFRASPEED MPVs (Netherlands) Non-passenger multiple units