Bedfordshire rail passengers are facing delays and cancellations for the second day in a row on Tuesday morning (June 9).
Thameslink services are being affected north of London after a person was hit by a train near Gatwick Airport.
Trains from Bedford, Flitwick, Harlington, Leagrave and Luton to the capital are being delayed or cancelled as services are held up heading north to Bedford.
The 08:05, 08:19 and l08:49 departures from Bedford have already been cancelled.
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A spokesman for Thameslink said: "It is with great sadness that we have to report that a person has been hit by a train between Three Bridges and East Croydon.
"Due to some lines being blocked, train services running through these stations will be cancelled or delayed.
"This incident is also affecting Thameslink services north of London. Disruption is expected until 10am."
Passengers planning to travel are advised to check National Rail Enquiries journey planner before leaving home.
On Monday, signal problems near Hendon forced Thameslink to cancel all early-morning services between Luton and London until around 9am.