The completion of the Blackfriars station project in the city of London, UK, a key part of the Thameslink rail line upgrade, has been delayed four months until 2012, according to building.co.uk.
The delay is partly due to the project's increasing cost, which has risen by £100m ($152m), officials from Network Rail have said.
According to the project's main contractor Balfour Beatty, the project is also facing design problems.
The station work involves lengthening platforms for 12-car trains, building a new roof over the bridge and extending the station across the Thames to build a station entrance on the south bank of the river.
The £5.5bn ($8.34bn) Thameslink upgrade is aimed at improving services on the congested rail line running between Bedford and Brighton.
Rail operator Network Rail is now under pressure to finish the station ahead of London's Olympic Games, scheduled to begin at the end of July 2012.