Network Rail is reportedly considering a complete shutdown of Queen Street station in Glasgow for as much as a year during upgrading works, which will include lengthening platforms to accommodate longer electric-powered trains and the installation of overhead electrical wires.
The rebuild is due to happen between August 2015 and December 2016.
The station is used by 21 million passengers a year and is particularly busy among commuters using the express service to Edinburgh, and tourists to Argyll and the Highlands.
Network Rail rejected reports that the station could close for a full year, but said closure was one option being considered. However, a spokesman stressed that a complete shutdown was "no more likely that anything else at this stage". He said: "A variety of options are being considered."