This very fine large building was once the station at Eskbank with the station master’s house.  It was built for the North British Railway in 1847 as part of the railway network for transporting coal to Edinburgh.  It then extended to Selkirk and Carlisle as The Waverley line.  When it was opened it was called Gallowshill Station which led me to investigate if there had formerly been gallows on a hill nearby but so far I have found nothing.  It was then renamed Eskbank with Dalkeith added when the D terminus was closed in 1954.  Like many stations it was closed under the Beeching Plan in 1969 and the track became part of a popular walkway.  In September 2015 the new Borders Railway to Tweedbank near Galashiels was opened using much of the original track and a new modern Eskbank station built just to the south.  The new station is a small structure typical of modern times and with car parking. 
The house was converted in the mid 1980s into residential flats.  It seems a large house for the former station masters although the booking office and waiting room would have been at the back and entered by the side door.