Re: It would be great...
Making sure that people can't wander onto the track is a bad thing? I know someone who sat through probably six hours of delays following on two suicides between Aberdeen and Wilmington. And you may remember the disaster of some months ago on the Metro North line above New York, where a woman trying to beat the gates got herself killed, along with a few commuters.
To create a new right of way between Washington and New York would require massive use of eminent domain, which can be a touchy political matter. Even with the leanest construction budget it would be quite expensive, with the money coming largely from appropriations. It would probably not be practical to have such a train stop anywhere but at the current Metroliner stops, and maybe not all of them. So if I live in Aberdeen and have my commute disrupted for years so that I can some day drive an hour and a half into Baltimore and save a couple of hours train time to New York, I might not see the benefit.
Yes, I guess it could get political.