25 March 1807 The Swansea and Mumbles Railway, then known as the Oystermouth Railway, became the first passenger-carrying railway in the world.
Swansea and Mumbles Railway, article from Wikipedia    https://en.wikipedia.org/wiki/Swansea_and_Mumbles_Railway

THE MUMBLES TRAIN   - Colin Bevan       https://www.youtube.com/watch?v=LKlDSPNJh_I&t=16s
THE MUMBLES TRAIN SONG  - Paul Conibear       https://www.youtube.com/watch?v=VhiRTzp9wcc