The Innocent Railway Tunnel

I bought a book over the holidays called "111 places in Edinburgh that you shouldn't miss" in an effort to find more unusual places in the city to visit and blip.
Today we visited our first place from the book, the Innocent Railway.  We started our walk  at St Leonards where the tunnel shown in the blip is and walked to Duddingston and back. 
A lovely way to finish my holidays, back to work tomorrow!

https://en.wikipedia.org/wiki/Edinburgh_and_Dalkeith_Railway