British Rail Class 321

The British Rail Class 321 is a class of electric multiple unit passenger trains built by British Rail Engineering Limited at York Carriage Works in three batches between 1988 and 1991 for Network SouthEast and Regional Railways. The class uses alternating current overhead electrification. Three sub-classes were built: the first two for Network SouthEast services from London Liverpool Street and London Euston, and the third for Regional Railways services from Leeds. Each unit has four carriages and a maximum speed of 100 mph. The design was successful and led to the development of the similar Class 320 and Class 322. After privatisation the units worked for several operators, were latterly run by Greater Anglia until April 2023, and some have been converted to Class 320 for ScotRail.