A Transport Scotland spokesman said:
"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.
More top news
Colder, windier and wetter weather is on the way.
Will the 'potentially historic' snow storm hitting the US, find its way to the UK?
ComRes polling agency chairman says the next 100 days will be be gruelling in the most uncertain General Election that anyone can remember.