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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 trai...

Called moving block. historically, what you would have is fixed block, so you have a colour light signal that tells the train that the next block is clear ahead. whereas with us, the train is making its physical own block as it goes along the track, meaning that you can run as many trains as you want to. i went along to the control room for the elizabeth line in east london to see how it looks from the other side. this is where the magic happens. this is where all the magic happens. as is often the case, technology also requires a human helping hand. you are currently shown as not cabbed. you ...

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 that the next block is clear ahead. whereas with us, the train is making its physical own block as it goes along the ...

Ahead, so there is always a safe gap between them all, which can't be maintained on the normal network because of where the signalling system is set up. now, it has been a bumpy ride to get to this point. 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 si...

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 that the next block is clear ahead, whereas with us, the train is making its physical own block as it goes along the track, meaning you can run as many trains as you want to. i we...