Further to PB84's post#10 -
A rail link to Edinburgh Airport (and Glasgow) was planned a few years ago. It got as far as letting the design contract in 2007. It would have been opened in 2011 but it was cancelled by a new government a few months later on the grounds of cost. Glasgow airport rail link also fell by the wayside. Evidently Scottish Gov. couldn’t afford these two rail links as well as the Edinburgh tram project. They decided to go ahead with the trams in spite of the fact that Edinburgh has an excellent bus service. How mad is that ?
Is my memory playing tricks or was there a small platform serving RAF Turnhouse up to the early 1960s ? The line runs past the old RAF accommodation site.