since been renumbered several times, as shown below: 8Dig units In 1992 four 8Dig units, numbered 2001-2004, were formed by semi-permanently coupling a 4Cig and a 4Big unit. The units were dedicated to London Victoria to Brighton express services, which were operated as the Capital–Coast Express. The 8Dig units were formed from four 'Phase 2' 4Big units plus two 'Phase 1' and two 'Phase 2' 4Cig units. The 'Phase 1' units, numbers 1901/02 (recently renumbered from 1715/16), were fitted with Mk.6 motor bogies. One of the 'Phase 2' 4Cig units, no. 1875 (ex. 7404), had previously been part of 8Mig unit 2602. Unit formations are listed below: The units were disbanded in 1996, after replacement by dedicated Class 319/2 units. The various 4Cig and 4Big units were reformed and gained their original numbers, except unit 1875, which was renumbered to 1802. Final years of operation Two units had remained in service until 22 May 2010, 3Cig units nos. 1497 and 1498, which were used on the Lymington Branch Line. These two units were withdrawn from service on 22 May 2010 and replaced by Class 158 Diesel Multiple Units. Towards the end of their life, with the increasing use of newer trains which were equipped with sliding or plug doors, these trains were known commonly as "slam-door trains". 1497 is now preserved at The Mid Norfolk Railway and 1498 is now preserved on the Epping Ongar Railway. The latter has had an extra carriage added to restore its original 4Cig formation. Privatisation to withdrawal After rail privatisation in the mid-1990s the different divisions of British Rail were divided up into different franchises. The three former SR division – South-Eastern, South Central and South-Western – all operated 4Cig units, and are dealt with separately here. South Eastern Trains South Eastern Trains (SET) operated a small fleet of three 'Phase 1' and 22 'Phase 2' 4Cig units. The franchise was originally operated by Connex South Eastern. All but one of the 'Phase 2' units continued to carry the obsolete Network SouthEast livery. One unit, no. 1870, was repainted into Connex South Eastern yellow and white. The three 'Phase 1' units were painted in white undercoat livery, since their use was originally only supposed to be short-term. However, despite this, the units remained in traffic for seven more years, from 1997 to 2004. They were popularly known as "Ghosts" by rail enthusiasts. From 2003