The World's Most Beautiful Railway

Two hundred lucky passengers board steam locomotive, Union of South Africa. There's a charity abseil from the Forth Bridge. A team of engineers scramble to erect the UK's largest landslide barrier.

The Flying Scotsman takes a tour of the railway it once called home as it returns to Edinburgh Waverley, where there is a very special treat waiting for one young steam enthusiast.

The show follows in Harry Potter's footsteps onboard the Jacobite steam train while YouTube sensations Geoff and Vicki head for the UK's highest train station.

Musician Hamish Napier celebrates the old Speyside. Haymarket station gets ready for the Spice Girls. And newly qualified conductor Sean joins his mum Angela on the job.

Volunteers are bringing steam trains back to Royal Deeside and Edinburgh Pride comes to Waverley. Plus, there is a trip to Wemyss Bay, the world's most beautiful railway station.

The show goes for a ride on the magical West Highland line. The secrets of Waverley station are revealed. And there's a trip to Blair Castle.