Glows in the dark?

Just across the road is the Edinburgh Suburban and South Side Junction Railway (also known as the Edinburgh South Suburban Railway or, more colloquially, the SouthSub).

It was closed to passenger traffic, and all the stations on it too, in 1962 by Dr Beeching.

Today it is still used for freight, and the occasional diverted passenger train. It has two darker uses. Once a week, the nuclear waste from Torness Power Station passes through in the middle of the night on the way to Sellafield for re-processing. And ordnance on the way to the Army bases in the Pentlands also travels along the rails. Cynics say these are the reasons that the line is still there, and carefully maintained.