 In 2007, the government's preferred option was to use diesel trains running on biodiesel, its White Paper "Delivering a Sustainable Railway", ruling out large-scale Railway electrification in Great Britain for the following five years.Following Gordon Brown's appointment as Prime Minister in 2007, Andrew Adonis was appointed Transport Secretary.He immediately began work on plans for a new high-speed route between London and Birmingham (later known as High Speed 2), which would augment the West Coast Main Line.