EXTRA carriages will be added to the vast majority of Borders Railway services this weekend after complaints of that some passengers had been left to stand for the hour-long journey between Edinburgh and Tweedbank.

ScotRail confirmed that 85 per cent of services on Saturday and 89 per cent on Sunday would operate with at least one additional carriage, and in many cases two additional carriages, to tackle overcrowding.

The operator had faced criticism from commuters and campaigners that it was running the popular new service with only two-carriage trains, leaving passengers, including children, standing in the aisles and others left behind on platforms along the route because the trains were already too busy.

A spokeswoman for ScotRail said they were using all available rolling stock to beef up capacity over the weekend.

She said: "We will continue to carefully monitor the number of passengers getting on and off at each station to achieve the best possible balance of demand versus availability of rolling stock. "Further changes may be required next week."

ScotRail previously blamed the "novelty factor" of the new railway for the high demand, with the weekend services particularly busy with families taking day trips.

Special steam train services, which are running three times a week until October, have also sold out.

The new Borders Railway opened to the public on September 6, 46 years and eight months since its predecessor, the Waverley Route, was axed as part of the Beeching cuts.

Rail consultant, David Spaven, author of 'Waverley Route: the battle for the Borders Railway' said the "shoddy experience" meant some new travellers would not use the railway again.

“The level of interest in travelling on the railway wasn’t at all ‘remarkable’ – it was highly predictable, and ScotRail were warned by campaigners, but chose to ignore well-informed advice," said Mr Spaven.

"Professional railway managers should not be deploying two-coach trains at the busiest travel times, when four or six coach trains are needed. It was critical to get things right in the first few weeks of the railway, but the opportunity to build on all the goodwill towards the new railway has been partly squandered.”