Re: acela or aircraft
Well, the Amtrak Acelas and HHP8s (a two headed version of it) run on a route known as the Northeast Corridor. These are the only rails I recall that are owned and maintained by Amtrak. I know someone who once worked as a breakman on one of the Freght railroads and he recalled that the Freght trains were restricted to running at certain times on those tracks. This was way before the NEC had Acelas, maybe in the late 1960s-late 70s (Havn't asked him when he did the job.) But I would assume that Amtrak still limits when the freght trains run.
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