Those travelling by train between London and Beckenham may be delayed this morning.
The Southern delays come as fed up passengers are forced to cough up 3.1 per cent more money to travel on a train.
Services may be cancelled between Streatham Hill / Beckenham Junction / Crystal Palace and London Bridge, and also between Norwood Junction.
Anyone going between Norwood Junction / West Croydon / London Bridge and London Victoria may also be set back.
These delays look unavoidable, with emergency services being called.
A National Rail statement read: "The emergency services are dealing with an incident between Norwood Junction and Tulse Hill. Trains through Crystal Palace may be delayed, cancelled or revised as a result."
All lines have since reopened, but passengers have been warned that disruption will last up until 8am.
As is stands, Southeastern services seem to be running smoothly this morning.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here