(WSP) system whereby the train's friction brakes were inhibited at low speeds after prolonged coasting (such as that occurring on approach to a station). The units were once again limited to for a short period until modifications to the software were made. As a result of the smaller cabin dimensions necessitated by the tilting geometry, the higher floor needed to package the tilting mechanisms themselves, and the need to provide disabled toilets, the units have a lower seating capacity than the nine-car Mark 2 and Mark 3 rakes that they replaced. The result has been severe overcrowding on some services, something that Virgin somewhat mitigated through the increased frequency of service, and with the increase to 11-car formations. The smaller size of the Pendolino windows has attracted comment and, in fact, the window size is unprecedented for British railway rolling stock. The wider window pillars mean that in some standard class carriages, 22.5% of the seats are parallel with either no window or only a limited portion of one, however the roll-over strength of the bodyshell was commented on regarding the crashworthiness performance of the train in the RAIB Accident Report into the derailment at Grayrigg. Grayrigg derailment On 23 February 2007, a faulty set of points caused a Virgin Trains Pendolino to derail near Grayrigg in Cumbria. The train, unit 390033, named "City of Glasgow", formed the 17:15 departure from bound for . 115 people were on board, one of whom died from trauma suffered in the crash. The train's excellent crashworthiness was credited with preventing more fatalities. The train was formally written off on 30 November 2007, owing to the prohibitive cost of repair against the price of a new unit; a driving car and carriage from the train were subsequently put into use for training purposes at the Virgin Trains Talent Academy in Crewe. Virgin Trains then leased a Class 90, Mk3 coaches and a DVT (Driving Van Trailer), all painted in Virgin's new livery, and nicknamed the "Pretendolino" by Alstom maintenance staff, as a temporary replacement for the train written off. Occasionally, the name even appeared in official communications. Subsequently, the set was handed back to the leasing company. Speed records In September 2006, a Pendolino completed the fastest ever southbound run along the length of the West Coast Main Line from Glasgow Central to London Euston, at 3hours, 55minutes. The previous record was 4hours, 14minutes,