For some time, a return trip was worked by a Pendolino on Thursdays only, but over the following months, the type took over the Manchester services, and was soon introduced on routes from London to , , and . By late 2003, the last of the elderly Class 86 locomotives had been withdrawn from the route. During 2004, the fleet's sphere of operation was expanded further. Pendolinos started to operate services to , and by the end of summer, in theory, all services north of Preston were worked by Class 390 units. This allowed the final Class 90 locomotives to be withdrawn, and inroads were made into the main Class 87 fleet. It was expected that all locomotive-hauled trains would have been replaced by the end of 2004, but the Pendolinos suffered from several technical problems, which granted the Class 87s a temporary reprieve. By January 2005, only eight locomotives remained, for use on peak London Euston to Birmingham New Street services. Another development during 2004 was the clearing of the units for the North Wales Coast Line from to . This line is not electrified, so Virgin's Class 57/3 Thunderbird diesel locomotives were used to haul the Pendolinos. After Virgin Trains lost the CrossCountry franchise, the company decided to allocate its remaining Class 221 Super Voyagers to the coastal line, ending the practice of hauling Pendolinos from Crewe and thus making several Class 57 locomotives redundant. These locomotives have special Dellner coupling adaptors and electrical systems to make them compatible with Pendolino trains, allowing failed units to be rescued quicker. The Class 57s are also used when engineering works force Pendolino services to run over non-electrified diversionary routes. The entire Pendolino fleet is allocated to Alstom's Manchester Traincare Centre at Longsight, where heavy maintenance is carried out. Longsight has a hoist on which an entire Pendolino unit can be lifted. Lighter maintenance, cleaning and overnight stabling are carried out at Alstom's other centres: Wembley (London), Oxley (Wolverhampton), Edge Hill (Liverpool) and Polmadie (Glasgow). On 5 April 2012, the first 11-car Pendolino entered service on the London-Birmingham-Wolverhampton and London-Manchester routes. Problems and incidents In October 2004, a train overshot the platform at station and collided with the buffer stops, and a similar incident occurred a few weeks later at the same station. The Rail Safety and Standards Board's inquiry into the incident identified a software glitch in the wheel-slip protection