A railway line operating between Stirling, Alloa and Kincardine requires around £17m of major upgrading work, despite only opening five years ago.
Network Rail has revealed some sections of the 13-mile track require work due to the level of coal train traffic on the line.
A Network Rail spokesman said: ‘We intend to carry out a rolling programme of works to renew some sections of the line that require formation treatment to support the ongoing tonnages of coal traffic. We will also be carrying out drainage works to future proof the route against wet and more severe winters.’
He added it would not be possible to determine the cause of the problem until work begins, dismissing reports that the problems stem from the fact that the track was laid on soft ground allowing the railway to move out of shape.