had been wrongly wired. 4 March 1989: 6 people died and 94 were injured when two trains collided at Purley when one passed a red signal. Later heritage lines As to lines closed during the time the region existed, some are preserved railways, mainly the Watercress Line, Bluebell Railway, Spa Valley Railway, Isle of Wight Steam Railway, Swanage Railway and Dartmoor Railway. References Ball, MG. British Railways Atlas Ian Allan Publishing 2004. London Railway Atlas Railway Clearing House, London 1935 Dudley, G. Why Does Policy Change? - Lessons from British Transport Policy 1945-99 Routledge 2001 Hoyle,R The Atmospheric Southern Corhampton Kevin Robertson 2007 Moody, G.T. Southern Electric 4th edition; Ian Allan Publishing 1968 British Rail regions 750 V DC railway electrification