25Hz wrote:
(Specs say its max operational speed is 135, but i'm not sure if that is it's absolute max or the "rev limiter" for revenue service)
135 is probably not the "absolute" max. If Amtrak really wanted to play with the locomotive, they could probably get it to run much faster. However, that is obviously impractical, considering the wear on the motors and gearing units at such speeds. I am saying this simply because an unmodified Siemens Taurus locomotive over in Europe reached 357 km/h (222 mph) during one such test run.
The 135 number is simply a semantic in this case, since the FRA probably has some requirement for the locomotives to be certified to run at a speed somewhat higher than planned max revenue service speed to ensure that there is some kind of margin of error (safety wise). The you will not see these locomotives run more than 125 in revenue service. I would expect the onboard computer to electronically cut off tractive effort (power to the motors) if the units exceeded 125 in service, say, running downhill or something.