Answers: Both systems are used. The main East and West Coast lines from London to Leeds and Edinburgh and to Birmingham Manchester/Liverpool Glasgow respectively (and one of the lines between the two Scottish cities) are electrified on the overhead principal - (power is drawn from the National Grid). Locos/units are supplied near a pantograph for current collection. Lines into East Anglia are also electrified via the overhead. Services north of Edinburgh/Glasgow use diesel power - necessitating diesel trains from London to Aberdeen and Inverness. Lines to the west and to Wales use diesel power as do cross country lines from the North-east and North-West to the South and South-West. Lines within the South East and South - as far as Bournemouth and Poole - are electrified, but on the third rail system where on earth power is collected by 'shoes' on the underside of the bogies.. Virtually all passenger trains both diesel and electric powered are presently multiple units, including the High Speed Trains and the fresh Pendolino electric units on the West Coast flash. The only loco haul trains are those on the East Coast - on the electrified parts - but even they look at first glance close to a multiple unit. The Channel Tunnel Eurostar file is electrified, again on the overhead principal.
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