Actually, rather than high-speed bullet trains it very well may be smarter to end service at Coatesville or Parkesburg with more trains running rather than keep the line open to Harrisburg which very well may be for based more on politcs rather than what people want.
That would be silly. Over ½ million passengers embark/disembark at Harrisburg every year. (source)
IOW, if people want the Harrisburg stop and profit could be made from it then the Harrisburg stop would be kept, right? :-)