The Balerno line was a short loop railway in the southern suburbs of Edinburgh, Scotland. It was 6 miles in length, leaving the main Caledonian Railway Edinburgh to Carstairs line at Slateford, and rejoining it at Ravelrig. It was built by the Caledonian Railway mainly to service the many manufacturing enterprises situated along the upper Water of Leith, and passenger trains also ran. The line opened in 1874. As well as at Balerno, stations were constructed at Colinton, Juniper Green and Currie. The line was steeply graded.