Two train services scheduled to leave from Harpenden this morning have been cancelled.
The 8.10am service to Sutton in Surrey was cancelled along with the 8.26am train to Elephant and Castle in London.
Trespassers on the railway line near Brighton caused the knock-on disruption, but National Rail has since confirmed that services are now running normally.
All other scheduled trains are set to run as usual.
For live travel information visit https://www.thameslinkrailway.com/travel-information/plan-your-journey/live-departures-and-arrivals?from=HPD&type=departures
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