Tower Gateway station in London is to close this summer in order to enable work to extend platforms to take place.
The longer platforms are needed to cater for longer Docklands Light Railway (DLR) trains, due to increasing passenger numbers.
Two-carriage trains will be extended to three carriages and introduced on the busiest parts of the DLR next year.
A Transport for London spokesperson said the work will mean more passengers will be able to be accommodated for.
The station will close in June for the works which are expected to be completed by the end of April 2009.