What are the longest train journeys in the world?

For lovers of traveling and doing so in an environmentally responsible manner are increasingly looking at train travel. There are several opportunities to see great expanses of the globe from a train, including: Moscow to Pyongyang (10,267km or 6,379 miles), Trans-Siberian Railway (9,289km or 5,772 miles), Toronto to Vancouver (4,466km or 2,775miles), Chicago to Los Angeles (4,390km or 2,727miles), and Sydney to Perth (4,352km or 2,704miles).