Carlisle station roof, Fri 18 September 2015 1. looking north along platform 4. Patches of blue plastic sheeting show where roof glazing was blown down on 18th January. Network Rail announced in November 2015 that the roof will be replaced and the platforms rebuilt. The work will cost £14 million. It is due to start immediately and be completed in February 2018. The roof will be tackled before the platforms.