2012 seems a bit early, but if it must be possible to travel by rail from London to Beijing in 2020 in 48 hours, as suggested by The Daily Telegraph, a serious British paper, it can not be too far out. That means about 350 km/h.
Iran is investing in standard gauge railways in Afghanistan, even before the US intervention has been defeated, and is preparing to move the break of gauge between itself and Pakistan to a town in that country. Pakistan is considereing converting its whole system to standard gauge and the Central Asian countries, and eventually perhaps also Russia, might well be doing the same in the next thirty years or so.
See also the wikipedia article on the Trans-Asian Railway. That is about cargo transport.
We are not talking here about using the sea, but this is very relevant to the economic development of all the Asian, and European, countries. The relative weight of the US is bound to decrease by the resulting economic integration of so many countries.