Hi Audrey,
In 1885, houses in Greenbrae Loaning would probably have comprised a row of small cottages with a small farm half way along, known as a smallholding and which seems to have been attached to Bethal Cottage. As far as I know, the name Greenbrae probably arose from the fact that the area was surrounded by green fields on sloping ground (brae).
If you Google DG1 3DG, this will locate the Loaning which links the Lockerbie Road with the Annan Road, in Dumfries.
Hope this helps.