The threat of strike action on London’s underground network during the Olympic Games looks to have ended after the last union holding out for a deal said it had reached an agreement.

The RMT said it had secured a deal worth up to £850 each for its members after months of negotiations. Transport bosses had already reached a similar deal in principle with the other main Tube unions – the drivers’ union Aslef, Unite and the TSSA – but were waiting for the RMT to sign before signing off on the agreement.

The extra money reflects the extra hours that many staff members will have to work during the Olympic and Paralympic games this summer.

Transport for London said it “welcomed” the deal, which would “reward staff fairly for flexible working and [the] increased workload”.

Station, maintenance and service control staff and operational managers will receive up to £850 subject to attendance, customer satisfaction scores and working flexibly for defined periods.

Olympic pay deals were already in place for staff on London Overground – with a minimum payment of £600 each – and the Docklands Light Railway, which some union leaders have claimed could be worth more than £2,000. Some Network Rail staff will also receive a £500 bonus.

The only remaining threat of unrest comes from the bus drivers, where Unite is balloting 20,000 drivers over strike action unless they get a bonus of £500.

Transport for London is expecting an additional 3m journeys across London’s transport network on the busiest days of the games.

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