I drove from Eastern Long Island to Washington Union Station last night. My daughter and her car continued to Georgia, where she goes to college, and I returned to NYC via Amtrak train 190, departing 0315 hrs.
I had my TomTom GPS unit in my bag, so I fired it up and watched the speed of the train. It hit 125 at one point, and stayed in the 65 to 100 range for the majority of the trip.
I was reminded of the times I used a stopwatch and mileposts to determine the speed, back when I was kid riding in Pullmans behind a GG1. I used to see 120 MPH on a typical run.
GPS makes it easier and more accurate (and fun) since the unit kept trying to convince the "driver" to get off the tracks, and back on the road. The poor thing was so confused!