With comparable distances to cover, China and America have had very different approaches to transport.
While China has one of the biggest and busiest rail networks in the world, America remains wedded to its cars.
From California, North American correspondent Jonny Dymond examines if this might be about to change on the west coast.
American rail historian Richard White explains that a Californian high speed rail system would be "economically and environmentally disastrous" despite the large amount of money which it could make.
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