The NER electric units were electric multiple units that ran on the Tyneside Electrics, a suburban system based on the English city of Newcastle upon Tyne. In 1904 the North Eastern Railway electrified suburban services on Tyneside with a third rail at 600 V DC and built saloon cars that ran in 3-car to 8-car formations. More cars were built between 1908 and 1915 to cope with increased traffic. In 1918, a fire at Walkergate car shed destroyed 34 cars and replacement cars were built in 1920.

The North Eastern Railway (NER) was an English railway company. It was incorporated in 1854 by the combination of several existing railway companies. Later, it was amalgamated with other railways to form the London and North Eastern Railway at the Grouping in 1923. Its main line survives to the present day as part of the East Coast Main Line between London and Edinburgh.