Hi Duckman
Probably good to figure out what road it was on in the Greenbrae area. At least you can then check street view etc and get a feel on the age of the property you can see.
From at least 1915 to 1930 VRs, there looks to be a NICOL family showing at: HOUSE DOUGLAS COTTAGE 107 LOCKERBIE ROAD TANNOCK PLACE.
1915 also shows Mrs ELIZABETH RAE, Proprietor Occupier - HOUSE DOUGLAS COTTAGE GREENBRAE
A William Rae shows with a will reference at that address: Railway Guard, Douglas Cottage, Greenbrae, Dumfries, d. 25/06/1905 at Dumfries, testate. This is from an entry on SP in 1914.
Can't see Mrs Elizabeth Rae at that address in later years (post 1915). Maybe looking at the original VR with additonal addresses would help with its location?
Some posts here on RC
www.rootschat.com/forum/index.php?topic=337428.81Monica