Update: Network Rail's report into the Christmas chaos by infrastructure project director Dr Francis Paonessa will now be published on Monday 12 January at 2pm. Mark Carne said that he will not be commenting until after he reports to MPs at the Transport Select Committe on Wednesday 14th January.
MPs have called in Network Rail bosses Mark Carne and Robin Gisby to explain the chaos caused by engineering overruns at Kings Cross and Paddington at Christmas. What should they be asking?
The immediate dust has settled after the scenes of chaos at Finsbury Park in London, broadcast to the nation on TV just after Christmas after engineering works on the mainline between Kings Cross and Peterborough over ran.
However the inquest into what went wrong is far from over.
Network Rail is conducting its own inquiry led by infrastructure project director Dr Francis Paonessa - the man who, just six months into his new role at Network Rail, would have been immediately in charge of the Christmas blockade works. His report is due to be published on 9 January.
And then chief executive Mark Carne and managing director of operations Robin Gisby are being called to account by the Transport Committee on 14 January on events at Kings Cross and also Paddington.
So apart from the blow by blow detail of what specifically went wrong at Kings Cross and Paddington – rumoured to include the ordering of the wrong sort of track laying machine - what should the committee be asking?
Here are some options:
West Coast Main Line: The latest phase of upgrade work at Watford, Norton Bridge and Stafford has completed. After the last trains on Christmas Eve, work took place at Watford until early this morning to replace and install new sections of railway and bring into use a new modern signalling system. At Norton Bridge and Stafford engineers worked until the early hours of Sunday 28 December as part of a £250M package of improvements to improve the line and build a new flyover to remove the last remaining bottleneck on the West Coast main line.
East Coast Main Line: Between London King’s Cross and Peterborough more than 1000 people worked to complete 13 different projects. Further north, projects included bridge improvements in Dewsbury and Newcastle and track improvements near York and on the Doncaster to Leeds line.
Midland Main Line: On the route serving St Pancras hundreds of people completed projects including signalling alterations for the Thameslink project; the demolition and partial reconstruction of two bridges for the Midland Main Line electrification project and track improvements between Kettering and Corby and at Toton.
Thameslink: New signalling has successfully been installed on the New Cross Gate to Sydenham corridor and also in South London near Bermondsey allowing resumption of planned Southern and London Overground passenger services. Work to replace tracks at the entrance to the Hornsey Depot in North London has also been completed.
Scotland: The Edinburgh to Glasgow Improvement Project team demolished the roof of Carmuirs Tunnel, near Falkirk. They will install a new tunnel over the New Year break. Signalling was renewed between Haymarket and Inverkeithing and track work was undertaken in Queen Street Tunnel, Glasgow.
Anglia: Track renewals have been carried out between Stratford and Shenfield and upgrades to the overhead line equipment on the Great Eastern Main Line has been completed. Two bridges on the Gospel Oak to Barking line have been replaced. At Chadwell Heath work is underway on the eastern section of Crossrail.
Wales: A bridge was replaced over the River Teme on the line between Hereford and Shrewsbury. Bridge demolition work was also successfully completed on the South Wales Main Line between Newport and Cardiff as part of electrification works.