Commuters travelling through London Victoria are urged to use other stations after fire damage near the tracks.
Rush hour journeys have been hampered this morning after a trackside fire near Clapham Junction struck yesterday.
Vital signalling equipment was damaged after being engulfed by flames.
Trains that can run are expected to be extremely busy, and trains between Clapham Junction and London Victoria Hill face delays of up to 60 minutes.
National Rail said: ‘If you are planning to travel to or from London Victoria this morning, you are strongly advised to use an alternative London terminal instead.
‘An extremely reduced train service is running to and from London Victoria until at least 12:00, as emergency engineering repairs have been taking place overnight and throughout this morning.
‘We strongly advise that you delay travelling until later today or use an alternative route. Where possible, please travel into alternative London terminals and use the London Underground to complete your journey.
‘A limited half-hourly service will operate between London Victoria and East Croydon. These trains are expected to be extremely busy and should only be used if you cannot delay your journey or are unable to travel via an alternative terminal.’
Footage from the scene of the fire shows firefighters hosing down the smouldering remains of the signalling equipment, which appears to have burned to the ground.
Major disruption is expected to last at least until 2pm, National Rail said.
Metro contacted Network Rail and London Fire Brigade for a comment.
Which trains will be disrupted?
The good news is that London Overground and South Western Railway services can run as normal.
However, several routes will be ‘heavily disrupted’ throughout the day.
This includes trains:
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