The highest altitude train i.e. Tibet Railway of China operate trains at 160kmph which is restricted to 100 kmph on permafrost region. Let us see how our trains in Kashmir Valley, Arunachal fare when completed!

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They operate at 120kmph, not 160. The Qinghai-Tibet railway is operated with diesel locomotives with operational speeds of 120kmph on normal terrain and 100kmph on Permafrost ( as you stated).
The terrain in Arunachal is different from the Tibet plateau with more hills and less plains, so operational speeds may be restricted.

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So Indian Railway is ready to face one more challenge.
I am still eager to see that when and how will they complete Hrishikesh Karnprayag section.

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Sino-Indian war me Chinese troops Twang tak ghus aaye the isliye is area me Infrastructural Development bahoot jyada jarori hai, 1962 me humara paas Roads tak nahi the ki India apne troops ko mobilize ker sake jiska khamiyaja humne haar ka muh dekh ker uthaya tha. Ab Dubara agar waisi galti hui to hum Aksai Chin ko to kho hi chuke hai ab Arunachal ko bhi kho denge.

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