 This was done in stages from 1959 to 1974, initially connecting Birmingham, Manchester and Liverpool to London, and going on to Glasgow.The continuing electrification programme of the 1980s which saw the electrification of the East Coast Main Line, London St Pancras suburban system and further extension of the Southern Region network can be seen as a direct extension of this plan.Two serious crashes, the Harrow and Wealdstone rail crash in 1952 (in which 112 people died), and the Lewisham rail crash in 1957 (in which 90 people died) led to the introduction of the Automatic Warning System across the network.