the british rail class 350 "desiro" is class of electrical multiple unit built by siemens mobility from 2004- present. thirty of these units, known as class 350/1s, were built for use by central trains and silverlink on regional express services and central citylink services on the southern section of the west coast main line. a further 37 units known as class 350/2s were delivered to the uk for london midland. the "desiro" family also includes units of classes 185, 360, 444 and 450. this train is nearly identical to the 450, as it was originated from that.