Services have been cancelled this week, including trains running between Northampton and London, as well as the Abbey and Marston Vale lines in Bedfordshire, according to The Telegraph.
LNR said the disruptions is as a result of “Covid-19 and the ongoing impact of ‘test and trace’ notifications causing trains to be cancelled at short notice”.
Lawrence Bowman, LNR’s customer experience director, said: “We are experiencing more of this, across all our services, as increasing numbers of staff are getting ‘pinged’ by the test and trace app.
“We are sorry that we have had to make the decision to alter some services. However, the changes will help us run a more reliable and consistent timetable for passengers across our network.”
It comes just days after tube lines in London were forced to closed because of what is being dubbed the ‘pingdemic’.
Control roof staff on the Metropolitan Line were unable to turn up for work after being told to self-isolate by the app.
No services ran on the line, which runs between Aldgate and Amersham, Buckinghamshire, as staff had been contacted by NHS test and trace.
The Piccadilly and District lines were also affected.
Labour leader Sir Keir Starmer raised the question of self-isolation on Wednesday, asking during Prime Minister’s Questions: “If somebody’s pinged by the NHS app, as millions will be over coming weeks, should they isolate yes or no?”
Responding virtually, Boris Johnson - who is self-isolating at Chequers - replied: “I think that everybody understands the inconvenience of being pinged, as he rightly says here I am, I wish I was with you in the Commons chamber today.
“I apologise to everybody in business up and down the land in all kinds of services, public sector or otherwise who are experiencing inconvenience.”
From August 16, people who have received both doses of Covid vaccinations will be able to avoid isolation by returning a negative test instead.