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photograph by Mark Westcott
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When in 1957/58 it became time to replace steam hauled
stock on the non-electrified line from London to Hastings via Battle the
Southern Region opted for diesel electric multiple units (DEMUs). Unlike most
diesel multiple units (which have mechanical drives) the power cars on DEMUs
are effectively mini diesel-electric locomotives with final drive by electric
traction motors. Because the route between Tonbridge and Bo-Peep Junction had
tunnels with clearance restrictions (the existing steam hauled stock was
narrower than normal) the Hastings DEMUs were constructed 8 feet 2.5 inches
wide with flat sides.
The Hastings units originally appeared in three formations: 6S (class 201) "short" 6 car units built on 57 feet underframes 6L (class 202) "long" 6 car units built on 63ft 6in underframes 6B (class 203) "buffet" 6 car units which had a buffet in their formation replacing one TSO. In 1964/65 two 6B units were converted to 6L by exchanging their buffet cars for a TSO and in 1980 the all but one remaining 6B units were downgraded to 5L (class 203) by the removal of their buffet cars. Also in 1964 three 6S units were disbanded to provide six MBSOs and six TSOs which were then mated with six adapted 2 EPB driving trailers to form six "new" 3R units (class 206) for the Reading to Tonbridge services. In 1979 and 1980 two 6S units were reinstated following the disbanding of five of the 3R units and withdrawal of one 6B unit. Today a privately preserved Hastings DEMU is available for excursions and for hire by TOCs for service trains. |
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This page was last updated 24 October 2003