There have been major delays to services at Euston today after an incident between Milton Keynes and Watford Junction.
Lines were shutdown, though have since reopened, but delays are expected until 5pm.
A statement from National Rail said: "The emergency services have dealt with the incident between Watford Junction and Milton Keynes Central, allowing all lines to reopen.
"Disruption is expected until approximately 17:00."
It added: "Trains are subject to delays of up to 90 minutes with some trains cancelled or amended."
Passengers have been advised to seek alternative routes where possible.
