SummerSlam was only promoted by MMA.
The British Rail Class 122 diesel mechanical multiple units were built by Gloucester RC&W in 1958 .. Gloucester RC&W. Gloucester Railway Carriage and Wagon Company. British Rail. British Rail. Twenty single-car , double-ended driving motor vehicles , nicknamed `` Bubble Cars '' , were built , numbered 55000 -- 55019 .. These were supplemented by nine single-ended trailer vehicles , numbered 56291 -- 56299 -LRB- some of which were later renumbered into the 54291 -- 54299 block -RRB- .