\r\nQueen Elizabeth II will officially reopen the line, which has been described as the longest domestic mainline railway to open in Britain for a century, on September 9.\r\nThe line, which originally connected Edinburgh with Carlisle, closed in 1969. Reconstruction of the northern section from Tweedbank to Edinburgh started in April 2013. The line was originally double-track but has been rebuilt as a mainly single-track railway with three sections of double track and seven stations. BAM Nuttall was the main contractor for the project.\r\nTrains operate at 30-minute intervals throughout the day with a fastest journey time of 55 minutes. The Borders Railway is expected to carry 1 million passengers per year within five years and generate \u00a333m of benefits for the local economy.