Commuters are facing disruption after trains between London and Clapham Junction were cancelled because of a large fire next to the railway track.
Around 100 firefighters were called to tackle the blaze in a warehouse next to Clapham Junction station and residents nearby were advised to keep their windows closed.
Trains between the station and London Victoria were cancelled on Wednesday night after the fire service advised operators to close the line but services resumed, running slowly, early on Thursday morning.
A spokesman for Southern Rail said there could be a few delays for morning commuters because of a knock-on effect of the fire but all lines were open.
Passengers are advised to check the situation before they travel.
Southern Rail attempted to arrange alternative transport for passengers but some reported being stranded.
Passengers who have to take taxis can claim the cost back if they submit their receipt to Southern Rail's customer service department.
As well as around 100 firefighters and officers, 15 fire engines attended the blaze at the industrial estate in Culvert Place, Battersea, south London, which is under control but still continuing to burn, the London Fire Brigade said.
Flames soared above rooftops next to the railway line, while smoke could be seen from miles around.
London Fire Brigade received a call at 8.51pm on Wednesday and sent crews from Lambeth, Brixton, Tooting, Chelsea and Peckham to the scene.
Eight fire engines and around 60 firefighters and officers initially attended before the number of crews was increased.
The brigade said 999 control officers took around 90 emergency calls over the incident.
Station manager David Farr, who was at the scene said: "This is a large fire and crews are working hard to get it under control. It's producing a lot of smoke so we would advise local residents to keep doors and windows closed as a precaution."
The cause of the fire remains unknown.