I just rode the Pennsylvanian from NYP to Pittsburgh yesterday. For 95% of the ROW from Harrisburg to Pittsburgh, the ROW is still wide enough for 4 tracks even though it is now mostly two. In places where it is no longer wide enough for 4 tracks, either it's just a move of trackside equipment or there is enough for just a 3rd track. The notable exception being the last 5 or so miles from Swissvale PA to Pittsburgh where 50% of the old ROW has been turned into a busway.
Even at Galitzen, the unused portals could be enlarged and track re-layed.
If there ever was a "low hanging fruit" to restoring rail service at minimal (comparatively) cost, this would be it. With the exception of the eastern and western approaches to horseshoe curve, much of the route could also support higher speed service as well if the rail quality were up to snuff.
It's GOTTA be cheaper to install 1 more track along this line rated for 100mph travel that Amtrak gets priority on than most other high speed rail projects out there.
I'd like to see them raise PA turnpike tolls a half a cent per mile to subsidize this.
We are getting OT for the thread, but what the heck. A major issue with upgrading the current route is that according to the Amtrak timetables, it is 249 track miles from Harrisburg to Pittsburgh - via a route laid out in the mid 19th century. Driving from Harrisburg to Pittsburgh is around 205 miles and approx 3.5 hours, mostly via the PA Turnpike. That is a pretty significant advantage in distance for cars and the Mega/Boltbus services that is very difficult to make up with 90 or 100 mph max speeds over selected segments of the current route. Restoring a 3rd or 4th track over a couple of hundred miles is not going to be a "minimal" cost, even if the ROW is still there and NS is willing to cooperate. May have to improve/upgrade gates and signals for many grade crossings or separate some grade crossings, although I don't know how many there are between HAR and PGH. If Penn Railroad back in the day had made major upgrades to and electrified the corridor all the way to PGH or if the South Pennsylvania Railroad route had been built, Pittsburgh might well have better and much more frequency train service to Philly today.
There is a $1.5 million dollar study (with $750K from the HSIPR stimulus funding) underway to examine the options for Keystone West corridor service. Don't know how wide ranging the study is allowed to be and whether it might also look at options for a new HSR ROW route to Pittsburgh (the politics of choosing the route could get very sticky, let alone getting the funding). Or if it is constrained to what could be done to the current route. Maybe there are some modest cost projects that would reduce HAR-PGH trip times by 30 minutes.
Taking the long view, if PA and Amtrak can get the funding to upgrade the Keystone East corridor and reduce HAR to PHL trip times by 20 minutes, that should make that section perceived more as an HSR line and boost ridership. Then more people and politicians might ask why not extend 125-160 mph type service all the way to Pittsburgh?
Another long term factor is if the California HSR project succeeds and gets built, that will make people ask, why don't we have 3 hour train service between Pittsburgh and Philly? They are the 2 major cities in PA and any HSR route would go through Harrisburg (going through the state capital is always a plus in getting state legislatures to go along) and use the Keystone East corridor, so the route would be in 1 state, which makes the politics easier - provided leaders from both parties support it (big IF) - than HSR projects that cross multiple state lines (other than the NEC). But this is long term - 10-15 years or more.