London's Transport Commissioner, Peter Hendy CBE said:
"With London's population forecast to grow by one million people in the next 20 years, it is essential that we continue to invest in making our network more reliable and that we enable the London and UK economy to grow and prosper in the years ahead."
More top news
London Mayor Sadiq Khan is voted sixth most intelligent politician in history, according to a poll
Hollywood star Angelina Jolie Pitt is to become a visiting professor at the London School of Economics (LSE).
A red carpet made up of hundreds of thousands of handmade poppies has paid tribute to the armed forces at the RHS Chelsea Flower Show.