Yes, it is.
Commuting routes with many intersections and curves can not be speeded up, so 100 miles per hour is enough.
However, if you enable 125 mph in Class 385 in Edinburgh-Glasgow fastest route, could it be possible to cut 40 minutes?
I think such a thing.
Yes end
The Class 385s have a top speed of 100mph....that's it, you are wrong, end of!