Network Rail has replaced a railway junction as part of work on the London to Brighton line.
Contractor Colas Rail last weekend renewed Keymer Junction, near Wivelsfield in Sussex, to provide more reliable and comfortable journeys for passengers.
It was the first of four weekends where major work is taking place on the route, with buses replacing trains between Three Bridges and Brighton/Lewes.
Network Rail area director Steve Knight said: “Replacing an entire junction is a big job in itself, but it is just part of the work we are doing on the Brighton Main Line this autumn.
“We are also improving drainage through a tunnel, replacing another junction near Haywards Heath, and improving signalling near Balcombe. All of these upgrades will mean a better, more reliable railway.”
Further work will take place on the line on the weekends of 11/12 October; 18/19 October; and 15/16 November.