Engineering work is taking place in the Purley area, closing some lines from 23:00 on Monday to Thursday nights.
Buses will replace trains between London Bridge and Beckenham Junction / Streatham Hill.
Journey times will be increased when using replacement buses.
From 23:00 until the end of service each night, Thameslink services running through the Purley area will run to a revised timetable, with extended journey times.
You can plan your journey using the National Rail Enquiries Journey Planner.
For helpful advice if you need to travel on a rail replacement service, including accessibility and bicycle information, please use our Rail Replacement Services page.
You can find the pick-up and drop-off location of rail replacement services by checking station signage or by searching for your station on our Find a Station page.
Please be advised that replacement vehicles may be busier than usual, and you should allow extra time for your journey.