Commuters have been advised to stay away from one of the country's busiest passenger rail networks, following major disruption on the day it was announced that season ticket prices would rise by 3.6%.
South West Trains (SWT) urged customers not to use its services on Wednesday after serious problems on Tuesday caused by a points failure and a passenger train that derailed after hitting a Network Rail engineering wagon.
The failure and collision between Vauxhall and Waterloo at 5.40am affected services into Britain's busiest railway station, which is undergoing huge improvement works that have temporarily closed more than half its platforms.
Around 40 minutes later a train hit buffers at King's Cross Station, before a fume-filled Holborn underground station was briefly evacuated because of what London Fire Brigade said was an "overheated compressor".
In a statement on its website on Tuesday, SWT said: "An earlier points failure and an unrelated low-speed partial derailment has caused extensive disruption to services today.
"Trains are unable to use platforms one to 13 at London Waterloo and this reduction in available platforms means that many services will need to terminate before London Waterloo and many services will start away from London Waterloo.
"Most trains are experiencing severe delays and are subject to short notice alterations.
"Disruption to services is expected to persist until the end of service on August 16 2017.
"We now strongly advise customers not to travel on our network today or tomorrow."
None of the 23 passengers or two members of staff on board the train that partially derailed were injured, according to SWT and Network Rail.
Inquiries are under way to establish why the accident there and at King's Cross happened, the British Transport Police and Network Rail said.
The 0513 from Royston in Hertfordshire hit platform nine at King's Cross at around 6.20am.
It was a "low speed" collision and the Rail Accident Investigation Branch has been informed, said operator Great Northern.
Passenger Natasha Coello, 36, said: "We just all went flying. It's as if while we were slowing down it kind of accelerated again."
She said she feels as though she has pulled her collar bone, adding she could see a few injuries, but nothing major.
"No one expected it, and people just went from one end of the carriage to the other," she said.
Ms Coello said passengers could see smoke at the front of the train when leaving.
The Retail Price Index (RPI) measure of inflation, which the Government uses to calculate the rise in regulated rail fares, rose to 3.6% last month, from 3.5% in June.
The outcome puts millions of passengers on course for the largest increase in fares since 2013 when price changes come into force in the new year.
Regulated rail fares make up around half of all tickets and include season tickets, standard and saver return fares.