Passengers using GTR and Northern have been particularly affected, with some stranded on platforms for several hours.In the first two weeks, the proportion of trains either cancelled or delayed by more than 30 minutes was 13 per cent for GTR and 11 per cent for Northern. Labour would today seek a “no confidence” motion against transport secretary Chris Graying for the failings of the timetableCredit:Chris J Ratcliffe/Getty Passengers using GTR and Northern have been particularly affected, with some stranded on platforms for several hoursCredit: Andrew Matthews/PA Answering questions on what led to the fundamental failures of the timetable Mr Horton referred to the delayed decision that was made on the plan, leaving them with only three weeks to complete the timetable.“The biggest challenge we have faced is that normally when there is a major timetable change we expect the timetable to be finalised at least 12 weeks in advance of it starting,” he said. “On this occasion we were finalising the timetable three weeks before it started. And all the detailed, complicated resource planning tasks that we would normally spread over a three month period we had to complete in three.”During the meeting Northern Rail managing director David Brown said they had asked in January for the new timetable to be “rolled back” to allow for more planning time, however this decision was turned down by Network Rail. Mr Brown said limited infrastructure on the train lines meant “we had to plan the whole timetable in 16 weeks rather than 40. Had to completely rewrite the timetable for the north of England.” Both operators introduced temporary timetables on June 4, removing around six per cent of daily services in a bid to boost reliability.Jo Kaye, managing director and system operator at Network Rail said that whilst considerations had been made to delay the whole timetable, Network Rail had believed at the time that the mitigations being put in place would allow the new timetable to benefit customers.When asked by ministers whether she regretted the decision she responded: “Clearly that is one of the things I look back on and ask myself whether or not we could have foreseen the consequences of proceeding with the timetable rewrite in quite the way it manifested itself, so yes I would probably look at that decision differently.”This evening it was revealed that Labour would seek a “no confidence” motion against transport secretary Chris Graying on Tuesday for the failings of the timetable. The outgoing chief of beleaguered rail firm Govia Thameslink Railway has defended the new timetable that caused hundreds of trains to be cancelled, claiming it was “not the wrong plan”, but its execution had “not gone well”. Charles Horton, who announced his resignation from the company on Friday, was this evening grilled by MP on the Commons Transport Select Committee as to how the major failings of the new timetable that was introduced on May 20 were allowed to happen. Questioned by the committee over whether timetable had been a good idea, Mr Horton defended the implementation of the scheme saying: “Is it the wrong plan? No it’s not the wrong plan.”He explained: “Ultimately the result I think for customers is going to be very good, we will see those new journey opportunities opening up, we will see that new capacity, we will see that improvement in the quality of services. The problem we’ve been dealing with is the execution of the timetable has not gone well.”Mr Horton also revealed that despite the vast failings of GTR he believed the company had met their all their contractual obligations with Network rail, adding it was now up to them to decide if any penalty was going to be implemented. The Committee also heard from Nick Brown, chief operating officer at GTR that it was not until the evening of May 17 that rostas were deployed to local depots for drivers. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.