Six fire engines and around 40 firefighters were called to smoke issuing from an electrical room at Westminster Station on Bridge Street in Westminster.
Firefighters were called to a large amount of smoke coming from an electrical room within the basement of the station, which housed a compressed air powered effluent pump. Around 250 members of the public and around 10 members of staff left the station before the Brigade arrived.
The Brigade was called at 1129 and the incident was under control by 1249. Fire crews from Lambeth, Euston, Old Kent Road and Soho fire stations attended the scene.
The cause of the smoke was due to a failure of the pump housing.