Passengers on the West Coast mainline have experienced delays this afternoon due to the effects of the failure.
Virgin Trains confirmed that a points failure between Carlisle and Lockerbie had closed the line north.
The line reopened at around 4pm, but since then the knock-one effects have seen delays of around half an hour for services leaving Preston.
A Virgin spokesman said: "Due to a points failure between Carlisle and Lockerbie the North-bound line was blocked.
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"Delay Repay compensation is available to those who have been caught up in disruption and delayed by over 30 minutes."