I love train travel. By far the most civilised way to get around. Comfortable to sit. You can get up and wander round. Carry your own food and booze. Travel city centre to city centre with a minimum of queueing.
Nairobi – Mombassa sleeper watching wildlife through the parks.
Mexico City – Guadalahara – Cuidad Juarez (then enter the US on foot..). Third class mexican trains give the indian railways a run for their money
Southern Turkey to Istanbul sleeper
Galle – Kandy in SriLanka
Bangkok – Chiang Mai
Hanoi – Saigon
Most of my travel in India – Gorakhpur-Varanassi-Delhi-around Rajasthan
Luxor – Cairo sleeper
European stuff is less interesting and usually expensive compared to flying but much more civilised. Anything involving TGV/ICE/Eurostar/Swiss Railways is a breeze.
London to Alps Ski train sleeper was great when it ran. 2 extra days on the slopes vs flying.
South of France (Carcassonne) is easy
Switzerland I’ve done a load of times.
London – Fort William sleeper was a great way to start riding the Great Glen
I’ve got this idea about flying out to Turkey and coming back by train. Needs a good few weeks though.
The Man in Seat 61 is the font of all knowledge