The Glasgow, Dumfries and Carlisle Railway was a railway company in Scotland, which constructed the line from near Cumnock to Gretna Junction, forming the route from Glasgow to Carlisle via Dumfries, in association with other lines. Its promoters hoped it would form the only railway between central Scotland and England, but it lost out to rival companies.
It opened in stages between 1846 and 1850, and on completion of its line it merged with the Glasgow, Paisley, Kilmarnock and Ayr Railway. The combined company took the name Glasgow & South Western Railway (G&SWR). The G&SWR formed an alliance with the English Midland Railway and for many years express passenger trains ran between Glasgow and London over the routes. The line is open today, continuing to form part of the Glasgow - Kilmarnock - Dumfries - Carlisle line; but that has diminished in importance and is now a secondary route. Passenger services are operated by Abellio ScotRail.
My first ever find was near here but was recently disabled. This is the same cache container, but placed differently but similarly.