We've rounded up the world's greatest train trips, including a chocolate-themed journey through the Swiss Alps and a luxurious adventure aboard Japan's first luxury train service.

The world's greatest train journeys

Tren Crucero, Quito to Guayaquil, Ecuador

Andean Explorer, Cuzco to Lake Titicaca, Peru

Đường sắt Bắc–Nam, Hanoi to Ho Chi Minh City, Vietnam

Trans-Siberian Express, St Petersburg to Beijing, China

Via Rail, Toronto to Vancouver, Canada

The Seven Stars luxury cruise train, Kyushu, Japan

The Great Smoky Mountains Railroad, Nantahala Gorge Excursion, North Carolina, US

Bernina Express from Davos to Tirano, Italy

White Pass Railroad, Bennett Scenic Journey, Alaska

Rocky Mountaineer, Vancouver to Jasper, Canada

Glacier Express from Zermatt to St. Moritz, Switzerland

The North Yorkshire Moors railway, Pickering to Whitby, North Yorkshire, UK

Great Southern Rail, Adelaide to Darwin, Australia

Rovos Rail, Pretoria to Victoria Falls, South Africa

Golden Eagle Luxury Trains, Budapest to Tehran, Iran

Eastern & Oriental Express, Bangkok to Singapore

North Korea State Railway, Pyongyang to Beijing, China

Shinkansen, Tokyo to Hiroshima, Japan

Hiram Bingham, Cuzco to Machu Picchu, Peru

Dartmouth Steam Railway, Paignton To Kingswear, Devon, UK

The Swiss Chocolate Train, Montreux to Broc, Switzerland

Coastal Pacific, Christchurch to Picton, New Zealand