Rush-hour commuters were disrupted after a buckled rail stopped services.
Passengers waiting to board trains between Hastings and Eastbourne had to travel by alternative means after the fault was found outside Norman's Bay, near Eastbourne.
It was discovered by the driver of yesterday's 6.10am South Central-run Hastings to Eastbourne service.
The train contained two passengers but did not derail.
All trains between Hastings and Eastbourne were disrupted and South Central laid on 14 buses.
Full services were brought back into use at 2pm after engineers had straightened the rail.
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