Trains are at a standstill on the Cumbrian Coast line while safety checks are carried out on the track.
Train operator Northern Rail says delays are expected along the length of the line between Carlisle and Barrow until around 1pm.
Rail workers in Carlisle took part in day of action this morning, calling for the re-nationalisation of rail services in the North.
It was part of a region wide campaign in response to the news that German, Dutch, and French state railways had been shortlisted for the Northern Rail franchise.
But a spokesperson for the Department of Transport said the move was a step towards the creation of a northern powerhouse for the UK economy.
The number of seats on trains in the North West is to increase by a third, under Government plans to reduce overcrowding on the region’s rail network.
There will also be an extra 200 services every day across the Northern and Trans Pennine rail franchises, which cover Cumbria.
Transport Secretary Patrick McLoughlin says that Pacer trains will be scrapped as part of the plans.
Delays of around 30 minutes can be expected on Northern Rail trains between Whitehaven and Sellafield, due to a landslip at Braystones.
A replacement bus service is currently running on the Northern Rail line between Sellafield and Barrow-in-Furness, after reports of a person being hit by a train.
A replacement bus service is running on Northern Rail between Carlisle and Hexham due to an obstruction on the line at Haltwhistle.
All lines are blocked and journey times may be extended by 30 minutes.