MPs from across the Thames Valley have joined forces to call for a train franchise to be revoked after "devastating" changes to services.
First Great Western have responded with new adjustments to timetables
The group met with Transport Minister Douglas Alexander MP, after passengers labelled First Great Western's (FGW) service "commuter chaos".
Passengers across the region complained of overcrowding and a cut in services.
FGW, which introduced new timetables in December, has vowed to tackle problems and apologised for its performance.
Ahead of Wednesday's meeting, Martin Salter, Labour MP for Reading West, told BBC News: "It's about really drawing to his attention the complete chaos that has been created by the revised timetable and the real problems that a lot of the travelling public have had with FGW.
"I don't particularly want FGW to lose their franchise, what I want them to do is up their game - if they're not able to up their game, then what we're saying to the secretary of state for transport is find a company who can deliver."
Rob Wilson, Conservative MP for Reading East, criticised FGW for making large profits calling it a "slap in the face" for customers when service had been poor.
The meeting followed Royal Borough of Windsor and Maidenhead Council holding talks with rail bosses about residents' complaints and commuters signing an online petition over service.
Last month, FGW's new timetable was heavily criticised by passengers and local MPs who described it as "an unmitigated disaster" at a summit.
This week the train franchise announced plans to re-instate a late night train service to Newbury.
A FGW spokesman told BBC News the company had listened to a number of complaints from customers and made adjustments.
He added: "We've made a large number of adjustments, back in January additional services to Oxford, and re-introducing late night trains."