Chiltern Railways has started work on a £2.5 million car park deck at Warwick Parkway, creating an extra 222 spaces.
The new decking area, which is due to be opened in December, will bring the number of spaces at the station up from 737 to 959.
Malcolm Holmes, general manager Mainline at Chiltern Railways, said: “The launch of Mainline has resulted in a dramatic increase in passengers travelling from Warwick Parkway, with thousands of commuters using our service every week.”
“The new deck will create an additional 222 spaces to meet the rise in demand and demonstrates our commitment to providing the best travel experience.”
The Department for Transport will provide £1 million, working in conjunction with Chiltern Railways, towards the total cost of the project.
Rail Minister Theresa Villiers said: “I am delighted that we are able to announce the investment for this considerable car park extension at Warwick Parkway. There is no doubt that this will encourage more people to travel by train.”
“Adding additional car park capacity will mean more spaces for passengers, easing congestion and helping improve overall journey satisfaction.”