Channel of large post hill is the whole line of big luck railroad highest risk channel. The design is single-track railroad channel, full-length 14484 meters, setting " two horizontal strokes are made the same score " , channel is the biggest bury deeply 995 meters. The channel of large post hill with 14.5 long kilometers 2008 start working up to now 11 years still not be well versed in, refresh railroad history, a channel of the China that be called's unprecedented the most difficult driving. To drop the temperature of environment of the construction inside the hole, direct dizzy drop in temperature into large ice cube. Channel of hill of large post of railroad of Yunnan big luck: Unprecedented a channel of the most difficult driving