On the amazing World¨s highest Railway (Tanggula : 5072m) : Golmud – Lhasa Qinghai Tibet railway 1142 KM (960KM over 4000m & 550KM of it built on permafrost) over earthquake zones, in rarified air with oxygen supply carriages, 675 bridges, environmental friendly (totally trash free) and 33 wildlife crossing railway bridges viaducts for antelopes to pass built in 5 years at a cost of $ 3.68bn, 20,000+ workers, 6,000+ pieces of industrial equipment in sub zero temperatures