Long delays to trains in and out of London Euston are expected until midday.
All London Midland trains were bought to a standstill this morning following a fatal incident in Leighton Buzzard just after 6.30am.
Although all trains are now running, London Midland say it is likely there will be delays until at least lunch time.
Tickets are being accepted on Virgin, Chiltern and East Midlands train services.
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