Waiting for a train ....

Through in Edinburgh today with N, and we were waiting for a friend of his to come off a Glasgow train. I say "a " rather than "the" as N hadn't checked to see which train his friend was on, and was getting no reply when he tried phoning. So we hung around for a couple of trains to come in and I was looking around me in all directions as we waited. When I looked up I saw this.