Unlike Canada and the United States, most countries in Europe, the United Kingdom and Scotland have extensive rail service. The trains are modern and fast.
Australia's famous Ghan Train basically covers the entire country from south to north. It's a two night trip that links you with three great Australian cities-- Adelaide in the south, Alice Springs in the interior and Darwin on the northern coast.
If you visit China and get to Beijing, you should definitely consider visiting Tibet. Rather than fly, take the China-Tibet Train and you'll see a part of the world that is talked about but often not seen by the average tourist.
The Trans-Siberian Railroad runs from major cities like Moscow to the city of Vladivostok on the Sea of Japan. The Trans-Siberian boasts being the longest continuous rail service in the world.
According to Gar Warner, the Chicago Tribune's travel journalist, the Bergensbanen Train is is the best in the world. It connects Oslo and the coastal town of Bergen in what is called the Roof of Norway.
If you are traveling in the west coast of Mexico or trying to go beyond the typical tourist destinations than the Copper Canyon may be right up your alley. Wildlife enthusiasts will also like this trip because it rivals going through the Grand Canyon.
If you are traveling in the west coast of Canada, you owe it to yourself to explore more than coastal cities like Vancouver British Columbia. Of course Vancouver is beautiful, but there's so much more to western Canada. It's easily reached as well.
If you visit Japan and want to go beyond Tokyo, think about taking a Shinkansen train to Kyoto. You'll see the countryside and see Japanese life in Old Kyoto.