I wouldn't know how to narrow it down!

Close to home, I enjoy the Hope Valley line (Sheffield to Manchester) and the Great Western line through Dawlish and Teignmouth.

In India, some of the mountain railways are amazing: Shimla - Kalka was amazing (and one of the most famous) but the Kangra Valley railway was rather good too.

In Sri Lanka, we didn't get the observation car, but that didn't make us enjoy Ella - Kandy any less.

The Ghan across the Australian desert was amazing, just for the sheer scale of the thing. Some other long journeys like Moscow - Kislovodsk (in 3rd class - ouch) and Tashkent - Bukhara had a similar effect.

The most luxurious I've done was undoubtedly Cusco - Puno in Peru. Incredibly scenery and height - although I'm not sure I enjoyed it that much more than sitting on the steps of the bog standard class on the Cusco - Aguas Calientes line.

Travelling through Switzerland is always a pleasure, but you do have the danger of being plunged into tunnels just when you expect it to be scenic! But there are little bits of wonderful scenery away from the mountains too - like crossing the Great Belt in Denmark, or the Oresund.

I do hope to travel on the West Highland Line, Settle & Carlisle, Rhaetian Railway, Rocky Mountaineer, and many, many others!