Good morning--here is my report on the first day of the Palmetto stopping at PJC:
It was 11 minutes late into PJC and was led by AC-S #620. Its consist was several (sorry, didn't count exactly) Amfleet Is, the café car, several Amfleet IIs, the business car, and one of the new baggage cars. The conductors were directing people who were going short distances to the Amfleet Is. Ironically, if you paid more to sit in business class, you would be in an Amfleet I instead of a more comfortable Amfleet II.
There were at least 50 people on the platform, and after the train departed, there were just a handful left. So, at least on the first day, a lot of people got on at this small station (I think more than I have seen get on 181).
In my opinion, PJC would be a good Amtrak stop for more trains. It would get the Princeton intellectuals, who take trains as a matter of course, and the rich Princeton-area businesspeople going to DC or even New York. The crowds waiting to take NJT into New York at rush hour are huge at PJC, and if they are going to put up with NJT for an hour, I'm sure they would gladly take Amtrak, either north or south, if the trains were offered.