As part of the modernisation of the West Coast Main Line, the Strategic Rail Authority (SRA) ordered 30 Class 350 dual-voltage sets for use on stopping services by Central Trains and Silverlink. They are operated by West Midlands Trains. These units were originally ordered as Class 450 third-rail units for South West Trains, but following a review by the SRA they were diverted to the West Coast. The dual-voltage capability has only been used in service on temporary loan to Southern on Milton Keynes Central to East Croydon services whilst covering for a shortfall of Southern Class 377 units. In 2008/09 a further 37 Class 350/2 four-car units entered service with London Midland followed by 10 Class 350/3s in 2013. First TransPennine Express took delivery of 10 Class 350/4s in 2013.