Disruption on Great Northern and Thameslink rail between London and Stevenage is expected until the end of the day, though the lines reopened at around 8pm.
Emergency services attended the scene, according to National Rail.
In an update, Thameslink said: "Trains between these stations may be cancelled, delayed by up to 60 minutes or diverted via Hertford North."
National Rail enquiries tweeted: "It is with great sadness that we advise that a person has been hit by a train."
According to its website certain Grand Central, Great Northern and London North Eastern Railway trains were affected as well.
Commuters also spoke of delays and crowded platforms at Finsbury Park station following the incident.
National Rail has directed people towards The Samaritans and The Campaign Against Living Miserably (CALM) following the incident.
It said: "If you or someone close to you has been affected by this incident or other, there is always someone to talk to.
"You can contact the Samaritans on 116123 free at any time, on any phone.
"The CALM Helpline number is 0800 58 58 58, or 0808 802 58 58 in London."
A woman has been charged with murdering her two young daughters a year after the girls died.
Louise Porton, 22, is accused of killing 16-month-old Scarlett Vaughan and three-year-old Lexi Draper.
Both children died in hospital after paramedics were called to reports they had been found ill at their home in Rugby, Warwickshire.
Ms Porton, of Skiddaw, Rugby, is due to appear before magistrates in Leamington on Saturday.
Warwickshire Police said Lexi died in hospital after paramedics were called to reports she had been found unconscious in her home in the early hours of January 15 last year.
Scarlett then died on 1 February after paramedics were called to a report she had fallen ill, the force added.
A driver who caused a crash in which a mother lost her unborn child has been jailed for more than three years.
A court heard Stuart Wells, 29, may have fallen asleep at the wheel when he drove head-on into two cars on the B3151 at Somerton, Somerset, in March.
Jackie Luxon, who was pregnant, and her two-year-old daughter were both seriously injured in the crash.
Wells, of Sherborne, Dorset, admitted two charges of causing serious injury by dangerous driving.
He was jailed at Taunton Crown Court for three years and seven months and banned from driving for six years and 10 months.
Wells had initially tried to blame a sneeze for the crash but later accepted the case against him.
Sentencing him, Judge David Ticehurst said: "Mr and Mrs Luxon were looking forward to the birth of their child in a few weeks and the fact she is not recognised by the law no doubt adds to their sense of loss."
The court heard other motorists had seen Wells' Ford Fiesta repeatedly drift in and out of the opposite carriageway over a seven-mile period, while also driving in excess of the 40mph speed limit.
One driver described him as a "real nuisance" and said he was "driving aggressively".
The court was told Mrs Luxon's husband had just bought a new car and she was following behind when the crash took place.
Wells clipped Mr Luxon's car and crashed head-on into Mrs Luxon's car.
In victim impact statements, Mr and Mrs Luxon said that in one-split second "unquantifiable" pain had been inflicted upon them.
They said: "In the space of a few hours we lost one child and another was placed in a medically-induced coma."
Mrs Luxon added: "Our unborn daughter is not recognised in English law as she did not experience life outside my body.
"It's heartbreaking that no prosecution was made for the loss of her life and I hope that this is taken into consideration and changes are made in the law."
Crime Watch(wp/bbc)::: The way police cars are driven for 999 calls and pursuits will be reviewed after four deaths involving patrol vehicles in four days, a watchdog said.
Four people died in crashes in Warwickshire, Sandwell, London and Leicester from Wednesday to Saturday.
The Independent Office for Police Conduct (IOPC) said it would look for improvements in policy and procedure.
The AA welcomed the review and said the recent deaths could indicate a rise in the use of vehicles in crime.
The four people who died in the crashes involving police vehicles are:
Ian Todd, IOPC deputy director general, said: "The death of even one person on the roads, let alone four in such a short space of time, will be of concern.
"While there has been a spate of road traffic fatalities over the past week, deaths and serious injuries following pursuits and emergency responses are thankfully rare in comparison to the large number of such incidents police are involved in on a daily basis."
He said each death would be investigated "based on their own unique sets of circumstances".
Mr Todd said the IOPC would examine whether the police drivers were suitably trained and followed agreed policies and procedures.
"We will also look to see if there are changes and improvements which can be made to those procedures to reduce the risks of deaths and serious injuries in the future."
Edmund King, president of the AA, said: "The apparent increase in incidents may reflect the growth of the use of vehicles in general crime.
"This is one reason why we call for more cops in cars as they can help to apprehend the culprits of crimes and their presence can act as a deterrent."
Nick Lloyd, acting head of road safety at the Royal Society for the Prevention of Accidents, said he welcomed the review.
"It would make a lot of sense for good practice to be shared across all police forces any measures to improve safety rolled out right across forces.
"It's also important to remember how the wider public react to blue lights not just car users but pedestrians and cyclists."
Joshua Harris, from road safety charity Brake, said: "We would encourage police chiefs to review and update their guidance for their officers who are responding to emergency calls or engaged in 'blue light' pursuits."
Speaking from the World Economic Forum at Davos, where he has spent three days mingling with political and finance leaders, Mr Hammond revealed that many of the other 27 EU member states were indicating in private that they would “compromise” on their “red lines” for the sake of avoiding the “significant economic disruption” of Britain crashing out without a deal.
But responding to the hardline position spelled out by his French counterpart, Bruno Le Maire, he said other countries were being warmer. “I would just observe that the French have always been the hardest in this debate,” he said. In other key developments:
Mr Hammond repeatedly refused to rule out resigning from the Government if it “chose” to pursue a no-deal Brexit. But unlike Cabinet colleague Amber Rudd he said next Tuesday’s voting in the Commons was not “high noon” and that he would wish to oversee policies to mitigate the effects of crashing out.
Theresa May echoed the Queen’s plea for politicians clashing over Brexit to show respect for each other, saying through her spokesman that “we should always show great respect for the point of view of others”.
The pound briefly rose on reports that the Democratic Unionist Party might soften its opposition to the withdrawal agreement if the backstop was subject to a “short time limit”. The Sun report was not confirmed.
Senior members of the 1922 Committee that represents Conservative MPs, including Sir Graham Brady and Bob Blackman, tabled a new amendment offering support to Mrs May’s deal if the backstop is removed or limited.
Speaking to BBC Radio 4’s Today programme, Mr Hammond said EU leaders were discussing moving their red lines. “I don’t think the European Union is going to change its fundamental position around the backstop,” he said.
“But what I hear from European politicians and commentators that I have talked to here in Davos is that there is a process going on, of thinking very hard about where the EU has drawn its red lines, whether they really need to be in the place where they have been drawn.”
He suggested he was gaining ground among other EU figures that it was “not reasonable” to expect Britain to commit to a permanent backstop obligation when even EU membership could be cancelled with just two years’ notice.
He warned Tory MPs that the EU was making clear it would not remove the backstop.
And he praised the “more nuanced position” taken by some senior MPs in pressing for a time-limit or an exit mechanism. “They understand the challenge we’ve got at home, and generally, not all of them but many of them, want to help,” he said.
However, France today took an unbending approach. Mr Le Maire said the Irish border backstop issue was “done” and it was solely up to the UK to find a way out of the impasse.
“I’m afraid we have nothing to give,” he told Today from Davos. “An agreement is an agreement and the responsibility of Brexit is clearly on the shoulders of the British government, not on the shoulders of the governments of the EU member states.
“It is up to the British government to find the right way out, not us, the European governments.”
Asked again if the backstop could be changed, the finance minister replied: “It is done. It is done and I think that we have to stick to the deal.”
Responding, Mr Hammond said: “Let me just say something about my French counterpart Bruno Le Maire. Much as I respect Bruno Le Maire, I would just observe that the French have always been the hardest in this debate... I would urge you to talk to colleagues from other European [countries]. There are 27 countries involved in this discussion and they too will have to compromise to get to a position.” On his own position, Mr Hammond refused to rule out resigning in a no-deal Brexit three times on Today and another three times on Sky. “I’m not going to speculate because a lot depends on the circumstances,” he said. But he indicated he would not walk out next week when ministers are set to be whipped to vote against amendments designed to prevent a no-deal Brexit.
“The responsibility I have is to manage the economy in what is the best interests of the British people,” he said.
Home Secretary Ms Rudd has also refused to rule out resigning in a no-deal exit, as has Business Secretary Greg Clark. Mr Hammond said no deal would be irresponsible and “a very bad outcome”. “There will be very significant disruption in the short term and a very significant hit to our economy in the medium to long term.”
He said his job was to fight in government for a compromise. The Chancellor praised the Queen after she spoke at an event in Sandringham about seeking “common ground” and “never losing sight of the bigger picture”. He said: “I think there is huge wisdom in those words.”
Millions of British holidaymakers flying to Europe this summer were today warned they face chaotic queues of up to three hours at airports in countries such as Spain, Greece and Italy in the event of a no-deal Brexit.
Tom Jenkins, chief executive of the European Tourism Association (ETOA), which represents more than 900 travel operators and tourist bodies, said extra border checks required by Brussels would bring “tourism Armageddon”.
He said immigration desks at the most popular Mediterranean destinations such as Palma de Mallorca could be overwhelmed “even with Heathrow levels of investment”.
He added passengers at airports that hit capacity after two or three arrivals would face waits of several hours. He said: “As some airports have UK arrivals coming in every 10 to 20 minutes, unless something is done now, we are going to run into major difficulties.”
Delays will be caused European Commission rules issued in November that stop Britons using lanes allocated for citizens of EU or European Economic Area countries and Switzerland if the UK crashes out on March 29.
They will require immigration staff to make four extra entry checks on British travellers: the expiry date of the passport, a database confirmation of the validity of the passport, the purpose and length of stay, and whether the visitors can support themselves financially.
This will add an estimated 90 seconds per passenger to the usual 25 seconds spent at passport control. With each plane holding an average of 200 passengers, this could cause huge delays.
Portugal said earlier this week it would introduce special passport lanes for British tourists at Faro and Funchal airports.
However Mr Jenkins said EU member states would not unilaterally be able to relax rules imposed by Brussels.
Speaking after an emergency ETOA conference on Brexit at the Barbican this week, he warned that in the case of no deal, British airline passengers face “a cross between the volcanic ash cloud disruption and the three-day week”.
A spokesman for industry body Airlines UK said Britain’s major carriers had been planning for extra checks. He said: “The commission has been clear UK passengers will be treated as being from a third country and this will likely mean extra checks at the border.
“Individual EU member states will have to plan accordingly depending on their own infrastructure needs.
The commission has told them in no uncertain terms that they should prepare their airports for no deal.”
A UK government spokesperson said: “We welcome the proposal by the European Commission to put UK citizens on a visa-free list for short trips to the EU even in the event of no deal.
“We have been clear in our proposals that we want to ensure reciprocal measures on visa-free travel for tourists and short term business visitors with the EU.”
UK residents made a record 54.6 million visits to other EU member countries in 2017.
British employers have offered staff the biggest pay rises in 10 ten years in early 2019, a survey of companies suggested on Thursday, adding to signs that historically low unemployment is beginning to translate into faster wage growth.
Annual wage deals agreed this month stood at a median 2.8 percent, compared with awards of 2.0 percent in December, according to preliminary figures collected by pay data firm XpertHR.
Official data on Tuesday showed British workers’ pay grew at the fastest pace in over 10 years, up 3.4 percent, contrasting with other signs of an economic slowdown ahead of Brexit, as unemployment holds at its lowest rate since the mid-1970s.
“Despite the uncertainty surrounding Brexit outcomes, the first pay awards of 2019 are moving in a very positive direction,” XpertHR pay and benefits editor Sheila Attwood said.
XpertHR’s wage settlement data tends to show slower rates of growth than official data, which also factors in salary increases that workers receive when they change job.
The Bank of England has said it expects pay growth to improve and its chief economist Andy Haldane said in October that there were signs of a “new dawn” for wage increases.
Assuming a relatively smooth Brexit transition, the Bank of England has said it will need to raise interest rates gradually to offset inflation pressures from the labour market.
