The straight-shot NS track from outside Suffolk to outside Petersburg is limited to 79mph I'm pretty sure, and I don't know if there are plans to negotiate that higher. There are grade level crossings in those towns that the wife of the president of the old railway named after places in Sir Walter Scott novels, as the legend goes: Wakefield, Waverly, and several others. The southern elite's love for Scott was unfortunately tied up with post-Civil-War revanchism. To the point of naming towns in places that had been populated by English speakers for centuries... but that's another matter. (Yes they were named before 1861, so it's Disputanta-ble how it plays in post-1865.) Anyway, there's no Ashland situation on the line, but plenty of at-grade crossings.
Amtrak trains generally run 73mph - 79mph on that segment.