. . "16"^^ . "Sixteen Class 121 single-car, double-ended driving motor vehicles were built from 1960, numbered 55020\u201355035. These were supplemented by ten single-ended trailer vehicles, numbered 56280\u201356289 (later renumbered 54280\u201354289). They have a top speed of 70 mph, with slam-doors, and vacuum brakes."@en . "10"^^ . "British Rail Class 121"@en . . . .