Thameslink trains in Hertfordshire are expected to be disrupted all day today (Monday, 12 June).
The issues are affecting trains passing through Stevenage, North Hertfordshire, Welwyn Garden City, Hatfield, St Albans and Harpenden.
A fault with the signalling system between London Bridge and London St Pancras means that some Thameslink services have been cancelled and delayed, and trains on all lines have to run at reduced speeds.
A statement on Thameslink's website says that their services are delayed by "up to 45 minutes", and services passing through central London have been significantly reduced.
Trains between Peterborough and London will now terminate at and restart from London Kings Cross, with passengers needing to continue southwards advised to walk over to London St Pancras.
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The service between Luton and London is reduced, with Thameslink working on establishing an alternative service today running between Luton and Kentish Town.
Services between Cambridge and London are also subject to alterations.
Tickets are being accepted on:
- LNER services between Peterborough and Stevenage
- London buses between London Bridge and West Hampstead
- London underground, via any reasonable route
- London overground, via any reasonable route
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