Thameslink commuters travelling in and out of London are being advised to rethink their journeys home as a flooded tunnel between Farringdon and St Pancras has caused chaos.
A burst water main will mean that only four trains per hour will be running between London St Pancras and St Albans and Harpenden.
A spokesman for Govia, who operate all Thameslink services, confirmed that the company has had to slash their services.
He added that water company engineers need to isolate the leak without cutting off essential supplies to a nearby hospital.
He said: “This is half the off-peak service we usually run and not much more than a quarter of our normal peak service.
“We are encouraging people leaving London to take trains on our Great Northern route from Kings Cross or Moorgate and on to Welwyn Garden City where they can take a replacement bus service.”
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