A £70m project aimed at improving rail services on a busy commuter line has been completed.
Project Evergreen II includes two more platforms at Marylebone station in central London and more signals on the Chiltern Railways' line.
It is the first new platform at a big London station since rail privatisation more than 10 years ago.
The signal work will allow more trains to run and enable Chiltern to recover faster from delays, the company said.
The extra signals are on the line between Bicester and High Wycombe, between Princes Risborough and Aylesbury and in the Neasden area of north-west London.
The project has also involved the straightening of tracks at Beaconsfield in Buckinghamshire.
Chiltern Railways chairman Adrian Shooter said: "We currently have the record for the highest reliability in the London region, and second highest in the UK.
"This project enables us to further improve reliability and the service we provide to our customers."