A controversial multi-billion pound contract to build London's Crossrail project has moved a step closer to being built by Derby train builder Bombardier, as Siemens pulls out of the project.
In a statement, Siemens said: "Crossrail is a very large project and, since first undertaking our initial assessment of capacity and deliverability, Siemens has won multiple additional orders.
"To pursue another project of this scale could impact our ability to deliver our current commitments."
Crossrail will link Heathrow to East London.
Bids for the rail contract are due next month, with a decision expected by mid-2014.