Timelapse footage has been released of work that took place on Christmas Day at Bristol Temple Meads station.
The film shows engineers removing an old mail conveyor from the station to allow for installation of overhead electric wires.
A fleet of electric trains will be in operation from 2017, providing quicker, quieter journeys.
Network Rail west of England project director Andy Haynes said: “We worked hard to ensure the removal of the conveyor caused as little disruption to passengers as possible, which is why we chose to lift out the structure on Christmas Day when there weren’t any trains running.
“Now that it has been removed, those who live and work in Bristol are a step closer to the benefits that electrification and the new electric trains will bring.”