The expedition had set sail from the Thames river on 19 May 1845, carrying with it the hope of the nation for the discovery of a navigable route through the Arctic into the Pacific Ocean.

探险队于1845年5月19日从秦晤士河起航，带着与举国上下的希望，云发现一条从北极到太平洋的航道。

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Three new lines will begin whisking passengers to and fro before the Games start in August and, by 2020, the route map will comprise 19 lines and 561 kilometers of tracks, making the network one of the world's largest.

CNN: Beijing commuters feel the squeeze

Of over 2, 200 climbers who have made it to the top of the world's tallest peak since it was first conquered, only 19 have done so via this route.

CNN: The height of teamwork on Everest

The 6, 000-mile route travels through Argentina and is due to end in Santiago, Chile, on 19 January.

BBC: Tom Neathway