Passengers at Birmingham New Street are being urged to back the campaign for a railway station worthy of the city.
Thousands of postcards have been distributed for commuters to fill in and send to the Department for Transport.
It follows an admisison by Ministers earlier this week that a final decission on rebuilding New Street may not be made until next summer.
The cost of the project has been estimated at #500 million, including #380 million from public funds.
The latest effort to win Government support has been launched jointly by Birmingham Chamber of Commerce and Industry and the city council.
James Cooper, the Chamber's policy adviser, said: "There is no doubt the people of Birmingham need and deserve a world-class railway station.
"However, the Government has consistently shunted the plans into the sidings in favour of other schemes around the country.
"This is as close as the city has ever come to success with this project and we just need a final push to show Whitehall we mean business.
"Over the coming weeks, thousands of freepost postcards will be handed out to travellers and commuters and all theyive got to do is sign them and post them.
"The more support we get, the harder it will be for the Department for Transport to ignore us."
He added: "As an organisation that represents and provides services to business across the West Midlands, we simply cannot understate the importance of a refurbished station to the future competitiveness of the region.
"Every year, more people use New Street than Gatwick Airport, yet its appearance does not befit the status of Birmingham as a world-class city.
"The new scheme will increase passenger capacity by 150 per cent, create jobs and offer us a rail terminal of which we can be proud."
New Street could not cope with the passengers it already has and numbers are set to shoot up over the next 20 years.
It has become so overcrowded that staff have been forced to close it for safety reasons on a number of occasions.
An ambitious "Birmingham Gateway" scheme backed by MPs, the city council and business leaders would create a larger passenger area and relieve congestion.
But in a recent House of Commons debate, Transport Minister Tom Harris said a decision might be included in a Transport White Paper to be published next summer.
He warned: "The Government is working with Birmingham City Council and Network Rail to find a sensible and affordable solution.
"No decisions have yet been made. There is a considerable amount of work still to be done before we reach such a stage."