Here are some photos taken while taking the train from Chengdu to Lhasa, during the part of journey which covers the highland railway, and commonly known as Qingzang Railway (or Qinghai-Tibet Railway).
This is a high-elevation railway that connects Xining (Qinghai Province), to Lhasa, (Tibet Autonomous Region), in People's Republic of China.
Ref: http://en.wikipedia.org/wiki/Qinghai%E2%80%93Tibet_Railway
Qinghai Lake 青海湖
Golmud Station 格尔木站
Cuo Na Lake措那湖
Approaching Lhasa 快到拉萨咯