Birmingham's Edwardian Moor Street Station is to undergo a second major refurbishment, bringing the total amount of money spent on the historic building to £15.5 million since 2003.
Chiltern Railways and the Birmingham Alliance are behind a £4.5 million scheme to open a cafe-bar at the station entrance and provide a new passenger footbridge, lifts, waiting area and canopies.
But trains are still unlikely to be able to run into the original Moor Street platforms for another two years.
Despite an £11 million makeover two years ago, passengers still cannot fully use the station. Trains start and finish from temporary platforms several hundred yards from the Moor Street entrance.
Signalling work which is vital to re-opening platforms three and four will not be completed by Network Rail until 2007.
Birmingham Alliance, the developers of the Bullring, has already invested £7 million in refurbishing Moor Street and Chiltern Railways, which operates the station, put in £ 4 million.
Now the two partners are to invest a further £4 million and the city council £500,000 to improve passenger facilities.
More than 45,000 people use Moor Street Station each year and the numbers are forecast to increase.
The station is uniquely placed to service Eastside and the Bullring.
Richard Green, the director of Eastside, said: "Moor Street Station is a major transport hub with local rail services on the Solihull, Stratford and Stourbridge lines, and with Chiltern Railways servicing London Marylebone.
"The proposed private sector investment would allow a swift and beneficial enhancement of Moor Street Station to happen. The public realm, cafe-bar and passenger footbridge with lifts would greatly improve facilities for passengers. It would help to promote sustainable travel by rail and provide an improved transport gateway to the city."