Of similar body style and construction to contemporary
class 313, 315 and 507 units forty three class
508 units were introduced in 1979 and 1980 for inner suburban services from
Waterloo. Excepting the experimental 2/4 Pep units used between 1971 and 1976,
from which their design originates, they were the first above ground EMUs on
the Southern Region to have sliding doors. They were totally incompatible with
other Southern Region EMUs so they lacked the necessary operational flexibility
and they were not popular. As such they were regarded as a temporary stock
allocation until the more compatible class 455s
entered service in 1983. In 1981 the first two 508s were despatched north to
the Wirral lines to work alongside the similar class 507s there, with the
remainder leaving the Southern Region from 1983. However the Wirral requirement
was for 3 car trains so one trailer from each unit was retained to be
incorporated into new build class 455/7 formations.
By 1999 the Wirral lines - now Merseyrail - had a large quantity of surplus
Class 508 units. Connex South Eastern leased thirteen of them from
Angel Trains to replace slam door stock. They were first refurbished, including
installing 2+2 seating in the centre of the trailer car and wheel-in cycle
racks in one driving car and then assigned to Gillingham (Kent) depot. They
were re-introduced to Southern service on 3rd August 1998 and were then used on
Sittingbourne-Sheerness, Strood-Maidstone West, Maidstone West-Gatwick Airport
and London Bridge-Tunbridge Wells services.
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