The £1.5 billion deal will also see new fleet rolled out across the network.
Couple Wanted Over Murder Have Norfolk Links
Detectives have released details of two people they want to speak to in connection with a murder in Peterborough.
Officers are keen to speak to Joanna Dennehy and Gary Stretch about the murder of Kevin Lee, whose body was discovered in a ditch in Newborough on Saturday morning (March 30).
A post mortem revealed that Mr Lee, 48, from Fletton, Peterborough, died as a result of stab wounds.
Police want to trace Ms Dennehy, 30, and Mr Stretch, 47, in connection with his death who are both believed to have connections in Norfolk.
Detective Chief Inspector Martin Brunning, from the Bedfordshire, Cambridgeshire and Hertfordshire Major Crime Unit, said: "Gary and Joanna are very distinctive in their appearance which is why I am asking the public's for help.
"Gary Stretch is 7'3" with grey balding hair and Joanna Dennehy has a very distinctive green tattoo on her right cheek, beneath her eye.
"They are very recognisable - even more so if they are together. We are keen to hear from anyone who has information about their whereabouts or believes they may have seen them since 2pm on Good Friday (March 29).
"Both Gary and Joanna live in the Peterborough area, however, they may be anywhere in the UK and I appeal to the public to think about whether they have seen these two people or know where they are now. I need to locate them as a matter of urgency. I would also make a direct plea to Joanna and Gary - please contact police as it is important we speak to you."
Members of the public are urged not to approach either of them but to report any sightings to police.
A 23-year-old man from Peterborough who was arrested on Sunday on suspicion of murder on has been released on bail until May 24.
Anyone with information should contact Cambridgeshire's Major Crime Unit on 101 and quote Operation Darcy or Crimestoppers, anonymously, on 0800 555 111.
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