Class 305 had four subclasses: 305/1 units were generally deployed on inner suburban services on the Lea Valley lines out of London Liverpool Street to Chingford, Enfield Town and Hertford East.

[3] However, they were also used on the Great Eastern lines out of London Liverpool Street and occasionally worked out of their ‘normal’ operating area when coupled to a 305/2 unit or any of the compatible EMUs in use at the time.

305/2 units were generally deployed on outer suburban services on the Lea Valley Line out of London Liverpool Street to Bishops Stortford, the extent of electrification until 1987, where their average scheduled speed was 34 mph (55 km/h).

Most of the 305/2s were overhauled at Doncaster, painted in Regional Railways livery and shortened to 3-car sets, before moving to the Manchester area, taking over services previously diagrammed by Class 304 units.

[15] Five 305/5s (305501-502, 508, 517 and 519) moved to Glasgow Shields depot retaining their 4-car configuration; they finished their working lives running the route from Edinburgh Waverley to North Berwick.