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.
The worst affected services include Southern and Gatwick Express trains to and from Victoria, including to Gatwick Airport.
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.’
Major disruption is expected to last at least until 2pm, National Rail said.
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:
- Between London Victoria and Ore
- Between London Victoria and Littlehampton
- Between London Victoria and Epsom Downs
- Between London Victoria and London Bridge
- Between London Victoria and Dorking
- Between London Victoria and Brighton
- Between Clapham Junction and Watford Junction
- Between London Victoria and East Grinstead
- Gatwick Express between London Victoria and Gatwick Airport
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