Rail travellers have suffered disruption after four platforms were evacuated at London Waterloo following a small fire, South Western Railway said.
Trains between the country’s fourth-busiest station and Clapham Junction were affected after the incident on Sunday morning.
South Western Railway said trains could be cancelled, delayed or revised until 10.30am, though all lines have reopened.
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London Fire Brigade confirmed its crews were called to a smell of smoke at London Waterloo around 9.30am on Sunday.
Platforms 20 to 24 were out of use while the incident was dealt with.
It comes as disruption is expected on Avanti West Coast services on Sunday as Rail, Maritime and Transport Union (RMT) members have launched a number of walkouts in a dispute over rest day working.
Avanti has urged its customers to travel either side of Sunday, which marks the start of strike action every Sunday until May 25.
A reduced timetable is in place on the strike days, with fewer services running during limited operating hours.
On Sunday, Avanti West Coast will run one train an hour between London Euston and each of Birmingham, Manchester, Liverpool, and Preston.