London Underground staff will receive up to an additional �850 for working during the Olympics.

The Rail, Maritime and Transport (RMT) union said today it had reached an agreement with London Underground which protected existing agreements and allowed staff to work within the terms of their existing contracts.

Staff will also be in line for additional rewards packages of up to �850.

Transport for London (TfL) welcomed RMT’s acceptance of the proposals. The union joins Aslef and Unite, which have already signed up to the deal, and TSSA, which has agreed in principle.

Staff will receive up to �850 “subject to attendance, customer satisfaction scores and working flexibly for defined periods in order to deliver a successful Games”, said TfL.

RMT general secretary Bob Crow said: “After months of hard work by our negotiators we have been able to come to an agreement that both protects the contractual rights and existing agreements of our members and rewards them in recognition of what we all know will be the biggest transport challenge ever faced by this city.”

Howard Collins, London Underground chief operating officer, said: “I am pleased that we have now got agreement from all four unions on our proposals for how we can fairly reward staff over the London 2012 Games.

“I know our staff are keen to play their part in the Games and, now that we have agreement across the board, we can all look forward to focusing on supporting a fantastic summer of sport and cultural events in London.”

However, Mr Crow said he still had concerns about staffing during the Games.

He said: “On a separate issue RMT will continue to fight for safe staffing levels to deal with the stresses and strains on the system.

“We have seen from the repeated breakdowns over the past two weeks the impact of cuts to staffing and maintenance and it is our members who are out there fighting to hold the service together and they deserve both every penny they get and the right not to be bullied into accepting unfair and unsafe working practices.”