Comprising ex-diagram 2005 SO No. S1351S and ex-diagram 2403 BCK No. S6687S, Set 601 operated between November 1959 and December 1963. From September 1960, the set was noted as operating in the London Central District, on the Horsham to Guildford Branch, as well as on Horsham-Shoreham-Brighton cross country services. From June 1963, until scrapping, the set moved to the Central Section of the Southern Region of British Railways.
Typically coupled with a Wainwright 'H' Class locomotive before the introduction of diesel/electric multiple unit traction.