First there are no Viewliners on the Pennsylvanian, never were and still aren't.
Now for a little history. For several years, there were two trains that ran the route between NY, Philly, Pittsburgh the Pennsylvanian and the Three Rivers (3R's). The 3 R's actually ran all the way to Chicago and therefore had sleepers in addition to coaches, while the Pennsy a coach only train terminated at Pittsburgh.
When Amtrak entered the freight business, there was so much traffic to Chicago that they extended the Pennsy to Chicago, so that it too could carry freight. About 2 years ago, Amtrak started to exit the freight business and at that time the Pennsy was cut back to terminate at Pittsburgh once again.
That left only the 3R's running to Chicago, via Pittsburgh. Then last November, Amtrak rather abruptly decided that the continuing decline of the freight business meant that even the 3R's to Chicago was no longer needed to carry freight and the passenger load didn't pay well enough to keep the train running.
Now let me add the fact that the State of Pennsylvania actually help to pay Amtrak to run the Pennsy to Pittsburgh. Also there is a law that requires Amtrak to gives a 180 day warning to cities and towns on a route that Amtrak plans to stop serving.
So in November, Amtrak temporarily suspended the Pennsy, while continuing to run the 3R's. They did this to save money, since the State of Pennyslvania was still getting service to Pitt that they were helping to fund and Amtrak could save the cost of running two trains to Pitt. They also removed the sleeper service from the 3R's, again to help ave money. Additionally by continuing on to Chicago, they satisfied the 180 warning notice.
Well the 180 days are up at the end of this month. So at that point, Amtrak will cancel the 3R's totally and restore the Pennsy, since that is really the train that the State pays for.