I don't know if they still do but I thought the former-AT&SF also had some 90 mph stretches along the former Super Chief route in KS and CO.
Definitely they exceed 79 mph in SW Michigan, across Illinois on the way to St. Louis (Lincoln Service Corridor), I read they were planning on Wisconsin South of Milwaukee but before the Illinois border but I believe that is at least 3-4 years off.
The former AT&SF Surf Line has several stretches were 90 MPH is permitted. The line is equipt with inductive ATS.
Where outside of the Northeast Corridor are Amtrak's trains permitted to exceed 79 mph?
Rio Grande Valley, CFI,CFII
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