P.Kepler Wrote:
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> I think you have it backwards. My question was
> pertaining to the improvements in track technology
> since 4449 was new. Does the ride improve
> significantly on welded rail, concrete ties,
> freshly tamped and cleaned ballast ??


No, I have if right. To further clarify:

Class 1-- F--10, P--15
Class 2-- F--25, P--30
Class 3-- F--40, P--60
Class 4-- F--60, P--80
Class 5-- F--80, P--90
Class 6-- F--110, P--110
Amtrak special classes:
Class 7--P--125
Class 8--P--150

These are for northeast corridor speeds.