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 Transport Scotland spokesman said:
– Transport Scotland
"In response to the delivery date of the Borders project, we are currently finalising the commercial terms of the contract with Network Rail for handover to them of the scheme delivery, and expect to conclude those discussions later this month.
"The Borders Railway will re-establish passenger railway services for the people of Edinburgh, Midlothian and the Scottish Borders for the first time in over 40 years, delivering real economic and social development opportunities, and offering a fast and efficient railway that will be a real alternative to the car."
They add that the current scheme costs are £235-£295m at 2012 prices.
Council officials have said they are not surprised that the completion of the Borders Railway is likely to be a year later than planned, claiming that the end date was always likely to slip. New estimates put the finish date for the Tweedbank - Edinburgh line at 2015.
Latest estimates predict that the Borders Railway will not re-open until at least 2015 - a year later than planned. Project officials also believe that costs for the Tweedbank to Edinburgh route will be around £50 million higher than the £295 million budget.
Transport Scotland didn't comment on the estimates, but confirmed that they are currently finalising the commercial terms of the contract to build the line, and expect that process to be finished in the next few weeks. The Borders has been without a railway since the Beeching cuts of 1969.
Northern Rail is running rail replacement buses between Whitehaven and Sellafield after yesterday's derailment between St Bees and Nethertown. A train carrying 100 passengers - mainly Sellafield employees - partially derailed at 6.45am on Thursday after hitting a landslide. No one was injured.
The train sent to collect passengers on board this morning's derailed train has also become stuck in a landslide on Cumbria's coastal line. Passengers on the original train have now walked to nearby Nethertown Station instead.
The first train was carrying Sellafield workers to the nuclear plant when it derailed at 7.20am today after it hit a landslide near Nethertown. No passengers are reported to be injured.
Pictures of the landslip that caused a train to become derailed in west Cumbria have been released. No one was injured in the accident.
Emergency Services are continuing to deal with a two carriage passenger train which hit a landslide in west Cumbria.
Cumbria police say the train remained upright and there were no injuries to any passengers or staff.
A recovery train is being sent to pick up the passengers and take them to a reception centre at Sellafield.
Emergency services are dealing with a passenger train that has derailed in west Cumbria.
It happened near Nethertown, south of Caulderton. The two carriage train was travelling towards Sellafield and had employees on board.
The derailment happened at around 07.20 this morning, no injuries have been reported.
Drivers are being asked to avoid the area.