Passengers will be able to use the first two-thirds of the brand new concourse at London Bridge Station next week, as hoardings come down on platforms seven to fifteen.
New stairs and escalators will link platforms to the concourse below and there will be new routes into and out of the station.
Over the bank holiday weekend and the days that follow, the construction site will move away from the Southern and future Thameslink platforms and focus on the north of the station, where Southeastern trains to Cannon Street currently run.
This will mean major changes to services over the bank holiday, for the week after and until 2018.