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Yes, Amtrak's Regional Trains do go 125 MPH in places on the corridor.
But these cars are for long distance trains like the Silver Meteor, Silver Star, Cardinal, and the Crescent. Those trains currently can only travel at 100 MPH on the corridor. They are limited first by the current baggage cars and dining cars which can only go 100 MPH IIRC. And then the current Viewliner sleepers are limited to 110 MPH.
These new cars will allow for the long distance trains to run at the same speeds as the Regional trains. This will not only shorten overall runs times a bit; but it will make scheduling & dispatching the various train on the corridor easier.
2 days, 2 hours ago on Coming Soon: New Long Distance Cars