Rail unions say we're on the edge of a disaster. MPs say there could be serious injuries - or worse. The Mayor of London says Southern should be stripped of its franchise.
And the tens of thousands of commuters caught up in the chaos of delays in Sussex - and the closure of Brighton station last night - say the situation has become intolerable.
It's been a long dispute between Southern Rail and the unions. And, the delays and overcrowding are getting worse.
Malcolm Shaw heard from passenger Pam Roach, and Sadiq Khan, Mayor of London.
Southern train service unbelievably bad today ahead of strike tomorrow
Chucked off train at Hove because of "track defect" Other cancellations due to staff shortages +broken-down train. Chaos on @southernrailuk
Tens of thousands of passengers in the Thames Valley have been hit with major disruption after services were cancelled to and from Paddington.
The problems were caused by an empty train derailing at the London station yesterday. The incident meant that two Heathrow Express trains were stuck outside Paddington - blocking the main lines into the station. Thousands of passengers were left stranded or seriously delayed.
Rail services at Southern are disrupted for a second successive day – this time due to staff reporting sick.
Southern reported delays and cancellations across all 10 route areas including the Brighton mainline, Gatwick Express and Sussex Coast.
A spokesman reported: “Southern services are continuing to be affected by a high level of conductor sickness.”
In a bid to reduce the recent problems guards must now have a sick note from a GP every day they are off work, and are not allowed to self-certificate.
Staff reporting sick follows a 24-hour strike yesterday by RMT union train conductors in a long running dispute which includes changes to their role, the introduction of more driver-only operated trains and the closure of some ticket offices.
Celebrations have been held to mark the 40th anniversary of the High Speed Train. The trains were first introduced on the lines between Paddington, Reading, Newbury and Bristol.
When they were introduced they brought a new generation of faster travel all over the country.
The event was organised by Great Western Railway and attended by locomotives from all over the country.
And enthusiasts certainly didn't want to miss the event with 5,000 attending. Our Transport Correspondent Mike Pearse joined them.
He spoke to Great Western Railway spokesman Dan Panes, Sir Kenneth Grange who designed the train and Andy Mellors, Great Western Railway Engineering Director.
People who use Southern train services had some good news today. Talks about ending strike action by guards are to be held this Friday.
Yesterday long queues and hundreds of cancelled services - 700 of them - made getting around impossible for many. Mike Pearse reports.
Video report. Hundreds of rail conductors went on strike today in a row over plans to change the role of the guard. Around 400 RMT members who work for Southern Rail walked out from 11am in the first of two days of action.
The process for claiming rail refunds must be made 'more passenger-friendly', according to the rail regulator. New figures show 80 percent of passengers don't claim compensation they are entitled to. The Office of Rail and Road said operators needed to make the claims process easier for passengers by making people aware of their rights.
Critics say it has been a disaster and, tonight, are calling for our privatised rail network to return to public ownership.Read the full story ›
It's the busiest section of railway in Europe but a view passengers don't get to see! We put a camera in a South West Trains cab - and speeded it up.
Here is Waterloo to Wimbledon in 30 seconds.