This signal box was at the south end of the Newbattle Viaduct it controlled entry to West Bryans Siding and the mineral lines to Bryans Pit etc. (See the West Bryans Siding entry.)
The signal box was on the east side of the line. Trains leaving the mineral lines could run directly south from the reversing sidings just north of the box. Trains heading north would use a second set of reversing sidings to the south of the box and from these would cross the southbound line to the northbound line.
To protect West Bryans Siding from runaways coming from the south there were catchpoints at what would, from 1908, become the site of Newtongrange [1st] station.
The box closed in 1895 when the new connection to the collieries was put in at the Lady Victoria Pit Signal Box.
Interestingly the mineral line just east of West Bryans Siding had its own signal box at the level crossing over Main Street.
With removal of the signal box and siding Dalhousie station, north of Newbattle Viaduct, was closed and Newtongrange [1st] opened to serve the large mining village and Lady Victoria Pit.