371-703 Class 350 4-Car EMU 350407 First TransPennine ExpressRequires 3x 6 pin decoders for DCC Fitting The British Rail Class 350 Desiro is a family of electric multiple unit passenger train built by Siemens in 200405, 200809 and 201314. Thirty of these trains, designated Class 350 1, were built for use by Central Trains and Silverlink on regional express services and services on the southern section of the West Coast Main Line. A further 37 Class 350 2 units were ordered by then operator London Midland in