The project will allow the introduction of 10-coach trains that will increase capacity on the line during the morning peak by 50% from July 2016.
Passengers on the line will have to put up with periodic line closures over the winter and replacement bus services.
Drainage along 1km of the Crowborough Tunnel will also be replaced while Network Rail has possession of the line.
Network Rail started setting up site compounds in early August 2015, with permanent works starting this month at some sites and in the New Year for others. The stations will be completed on a staggered basis between February and July 2016.
The stations affected by the project are:
- Edenbridge Town: Both platforms to be extended by 114m to country end
- Hever: Both platforms to be extended by 114m to London end
- Cowden: Platform to be extended by 115m to London end
- Ashurst: Both platforms to be extended by 114m to country end
- Eridge: Platform to be extended by 100m to London end
- Crowborough: Both platforms to be extended by 87m to country end
- Buxted: Platform to be extended by 115m to London end
- Uckfield: Platform to be extended by 56m to London end
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