The Edinburgh and Dalkeith Railway was an early railway built to convey coal from pits in the vicinity of Dalkeith into the capital. It was a horse-operated line, with a terminus at St Leonards on the south side of Arthur’s Seat. Today it’s a nice walking and cycling path with a halfmile tunnel. A tablet has been erected naming the railway 'The Innocent Railway' on the basis that the line never suffered a fatal accident.