British Rail Class 121
W55033 at the Colne Valley Railway in original green livery
In service	1960 - 2017
Manufacturer	Pressed Steel Company
Family name	Bubble Car
Number built	16
Formation	1 car per trainset
Operator(s)	Arriva Trains Wales Chiltern Railways Network Rail
Specifications
Car length	64 ft 6 in (19,660 mm)
Width	9 ft 3 in (2,820 mm)
Height	12 ft 4 in (3,760 mm)
Maximum speed	70 mph (110 km/h)
Weight	38 tons

Sixteen Class 121 single-car driving motor vehicles were built from 1960, numbered 55020-55035. These were supplemented by ten trailer vehicles, numbered 56280-289 (later renumbered 54280-289). They had a top speed of 70 mph, with slam-doors, and vacuum brakes. The driving motor vehicles were nicknamed "Bubble Cars" by some enthusiasts.

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