>>1253623>It runs slow as fuckSlow is relative.
Brightline's got a better average speed than just about any other passenger train in the US. Only isolated sections of the Acela (and maybe that one train in Michigan) beat it.
The speed will be even better on the new sections. 125 mph is basically the maximum diesel-electric locomotives can do. Anything higher, and you need to look into gas turbines (the Bombardier JetTrain approach) or electrics (the everyone else approach).