The Labour Party is calling on the Transport Secretary to delay signing off the contract awarding the West Coast Mainline franchise to FirstGroup.
Services on the line, which includes the route from Holyhead to Euston, have been run by Virgin Trains for the last fifteen years. The UK Government announced earlier in August that the company had lost out in the latest franchise round.
Labour says MPs had been denied the chance to raise concerns about the deal because it was announced during the Commons summer recess.
FirstGroup claims it will deliver better value for taxpayers. It plans major improvements to the InterCity West Coast franchise to 'enhance the customer experience', including improved wifi and catering, as well as additional services and more seats and reducing standard anytime fares by 15% on average.
More than 100,000 members of the public have also signed an online petition against the decision, in a campaign supported by double Olympic champion Mo Farah, Apprentice star Lord Sugar and celebrity chef Jamie Oliver.