British Rail Class 320

The British Rail Class 320 is an electric multiple unit found on the Strathclyde rail network in central Scotland, mainly on the North Clyde and Argyle lines. It is effectively a three-car derivative of the Class 321 and was built in 1990 by British Rail Engineering Limited at its Holgate Road carriage works in York. Twenty-two three-car sets were ordered by Strathclyde Passenger Transport to replace the unrefurbished Class 303 units and all of the Class 311 units. The sets take 25 kV 50 Hz alternating current overhead supply through a high speed pantograph and use four Brush traction motors. They began life with a lower speed capability of 75 mph and without toilets, suited to the close station spacing of the North Clyde Line, and later refurbishments added toilets and raised the running speed to 90 mph. Seven Class 321 units were also converted to the Class 320/4 sub-class for ScotRail.