He said the industry's conventional wisdom was it was better to carry out major disruptive work over holiday periods, but added: "This level of disruption is wholly unacceptable and I am confident that Network Rail will learn necessary lessons to stop these things happening again".
The government recently warned that alternatives to HS2 could spell massive disruption on mainline railways, but expects others to accept massively disrupted local lives.
"At this late date, prompt passage of the USA Freedom Act by the Senate is the best way to minimize any possible disruption of our ability to protect the American people," Clapper said on Friday.
Ward is responsible for services running into and out of London Bridge, Cannon Street, Blackfriars, Charing Cross and Victoria which saw some disruption over Christmas, but not the worst which affected the King's Cross lines.
Carne, who earns £675,000 a year, had been in line for a £30,000 bonus this year but came under fire for being on holiday in Cornwall during the disruption on the network.
Without his puckish verve for disruption, it'd become a show about technical adequacy and endless piano ballads.
Rush-hour passengers on a trouble-hit commuter route in the south of England have faced more disruption, with delays and cancellations because of a broken rail.
There's a lot of other work throughout the country that we are monitoring very carefully and we'll do all we can not to repeat the dreadful disruption that we've caused today".
The government has apologised for the "totally unacceptable" disruption on the railways at Christmas but defended Network Rail, which it said completed most of its projects on time and attempted to limit disruption.
To prevent further labour action and disruption for all students across university campuses in Canada, university administrators will have to address these serious structural deficiencies that have decayed the quality of education and research at public universities in Canada and across North America.
Communities need to be persuaded that the years before the line opens are not just a period of cost, disruption and blight but also one of work and opportunity.
