BBCNEWS Click June 4, 2024 02:49:00
When construction began way back in 2009, it was europe's biggest infrastructure project. but it was beset by problems, and has opened 3.5 years late and £4 billion over budget. many of the delays to the project were put down to the complexity of integrating three separate signalling systems. to the east and to the west of london, drivers operate the trains manually, where more traditional signalling is in operation. the central core however uses a system of signalling called moving block. historically what you would have is fixed block, so you have a colour light signal that tells the train ...