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Troubled rail operators Thameslink and Northern Rail were responsible for more than 1,000 cancelled and delayed trains in just one day.

Major disruption caused by the introduction of new timetables for the crisis-hit companies could now be investigated by MPs.

Lilian Greenwood, chair of the Transport Select Committee, described the cancellation of hundreds of trains on the two networks as a "complete shambles".

She will ask the committee on Monday to "review the situation", which may lead to a full inquiry.

Ms Greenwood said: "The ongoing timetabling chaos is making the lives of passengers very difficult.

"The Transport Committee has discussed the problems and is watching the situation carefully."

New Thameslink Trains - In pictures 7 show all New Thameslink Trains - In pictures 1/7 The new Thameslink trains will have a series of high-tech features designed to make journeys more comfortable for commuters Thameslink Trains 2/7 The trains will be air-conditioned and have more standing space Thameslink Trains 3/7 The new stock will have screens that show where the empty carriages are Thameslink Trains 4/7 The new trains will be able to carry 1,750 people Thameslink Trains 5/7 The trains will have fully accessible toilets for disabled passengers and those with pushchairs or needing baby changing facilities Thameslink Trains 6/7 The trains also have increased space for passengers' luggage Thameslink Trains 7/7 The new trains will be running on the Brighton to Bedford route through central London within weeks Thameslink Trains 1/7 The new Thameslink trains will have a series of high-tech features designed to make journeys more comfortable for commuters Thameslink Trains 2/7 The trains will be air-conditioned and have more standing space Thameslink Trains 3/7 The new stock will have screens that show where the empty carriages are Thameslink Trains 4/7 The new trains will be able to carry 1,750 people Thameslink Trains 5/7 The trains will have fully accessible toilets for disabled passengers and those with pushchairs or needing baby changing facilities Thameslink Trains 6/7 The trains also have increased space for passengers' luggage Thameslink Trains 7/7 The new trains will be running on the Brighton to Bedford route through central London within weeks Thameslink Trains

The Labour MP for Nottingham South claimed Transport Secretary Chris Grayling, Network Rail and the train operating companies have "questions to answer" about the introduction of the timetables on May 20 and how they managed the subsequent disruption.

She added: "They should be accounting for the decisions they took that led to this complete shambles."

Almost 1,000 trains were either cancelled or more than 30 minutes late on Wednesday , the equivalent to more than one in every eight scheduled services.

Britain's rail timetable is updated twice a year, but the latest version has many more changes than normal in a bid to improve punctuality and account for extra services and capacity following billions of pounds of investment.

The timing of all GTR and most Northern trains was changed, but all the new journeys needed to be individually approved by government-owned Network Rail, which is responsible for managing infrastructure.

Network Rail, GTR and Northern apologised to passengers, blaming the "sheer number of changes" and late running engineering projects for a delay in approving the new timetables and making amendments.

This meant train companies had "much less time to prepare". There were fresh "logistical challenges" and driver training requirements caused by the alterations to the schedules submitted to Network Rail.

Mark Carne, Network Rail's chief executive, said: "There is no doubt that the May timetable was finalised significantly later than normal for reasons that were both within and without our control."

Transport Secretary Chris Grayling has claimed the rail industry "failed the passengers it serves".

Additional reporting by Press Association.