I'm not very interested into freight corridors, but as far as I know Chinese railway has the second largest freight volume after US(their freight locomotives are the best),
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In China, railway freight transport is crucial(especially raw material, primary industrial products).
Along with expressway network and national highway network, they form a modern logistics system.
However, that's also why China is interested in HSR and intercity HSR, give more room to both passengers trains and freight trains(this was the primary reason 10 years ago).
In China, railway is mostly for long-distance passengers(>500-1000km for normal trains) and freight transport. And public bus and cargo trucks are for short distance.(expressways are also for long-distance freight transport as well). To separate them into separate lines are our main concern in the ongoing railway reforms.
LOCOMOTIVES
There are numeral cases of cooperation between China and European/American railway giants(Alstom, Siemens, bombardier, etc).
Like HXD1(10000kw, 120km/h),HXD3D(7200kw, 160km/h), HXD3A(under test, 9600kw). They are dedicated in designing more powerful locomotives which will operate on freight railway.
Heavy Haulage
The future tendency of railway around the world is HSR and heavy haulage, the latter one is now only in USA, China, Russia, Canada, Australia, etc.
http://en.wikipedia.org/wiki/Datong–Qinhuangdao_Railway (annual profit: 11.8 billion yuan)
one train=30000ton, the busiest freight line in the world
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