i am unfamiliar with the condition of the tracks on that corridor but in general the vast majority of lines in the US are limited to below 80mph due to the infamous FRA 79 mph rule which mandates in cab signaling to exceed 80mph.

with the near ubiquity of positive train control now following the FRA's unfunded mandate (another brilliant piece of policy from the boys in blue) this rule should no longer apply. but due to reasons unknown to me (bureaucratic mire?) trains on many corridors are still limited.

there are also some grade crossing related speed restrictions

the FRA and its cronies should be hurled into the sun