Industrial action has forced Heathrow Express to operate an amended timetable today (May 27) and tomorrow.
Heathrow Express will only operate half-hourly trains on May 27 and 28, between 8am and 8pm. Journey times will be as normal.
The walk-out by some 300 Heathrow Express members of the RMT union is over pay.
Bob Crow, the transport union’s general secretary, said Heathrow Express had “tabled a completely unacceptable pay offer”.
He said: “Despite a massive vote for action by our members it has made no attempt to negotiate or improve its position.
“We are ready to negotiate seriously to put in place a fair pay package that will take us through the Olympics period and recognises the contribution our members make to delivering a highly successful and profitable service, and we need the company to show the same commitment.”
Report by Sara Turner