According to the WDWMagic.com site (Expedition Everest) these are some of the numbers:
Max Height of Track: 120 ft
Max Drop: 80ft
Max Speed: 50mph
Trains will travel in both forward and backward directions.
I don't remember where I read the differing heights at. The cancelation of the Yeti was mentioned by a, mostly well regarded poster on the News and Rumors board.
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