Train operators are attempting to run a normal service from Northampton and Milton Keynes during today's morning rush hour.
An LNR spokesman said the company is running a normal timetable but there could be some disruption until 8am.
Arrest made after woman stabbed in Northampton
IN COURT: Offenders from Northampton and Daventry sentenced by local magistrates
‘Sacked’ Northamptonshire Sergeant claims discrimination because he is ‘male and a police officer’
Military veteran spared jail by Northampton judge after admitting cache indecent pictures and videos
Northampton judge jails burglar who's clocked up 100 offences over 30 years
The 6.50pm departure from Northampton was cancelled but later services were departing and arriving on time according to National Rail Enquiries.
Some passengers were stranded in the capital after torrential rain closed lines out of Euston.
Commuters were advised not to attempt to travel home with no trains running between London and Milton Keynes.
Passengers who diverted to use East Midlands Railway trains to Wellingborough were also beset with problems as part of the Midland Mainline also flooded at Belsize Tunnel.
Cars were submerged as roads filled with water after two inches of rain fell on London in an hour.