From WAS to NYP, trains 2124 and 2126 (6 and 7 pm Acela) have been full on Thursdays for several weeks running. I've arrived early for 2124 and found I had to take 2126, or arrived early for 2126 and found I had to take a regional, several times. I hope Amtrak opens an additional Acela service or adds a car to an existing service.
That would be nice, but there are no more "cars" to add (the trains are semi-permanent sets with no spare "cars"), and no more trains. And they broke the mold, too.