People have said that. I would love to use the one in NYP, but I think its the only part of Penn I don't know inside out. Where is it? And how do I convince the lounge attendant of that?
Your sleeper tickets qualify you as a First Class passenger on Amtrak. As a first class passenger you are entitled to utilize Amtrak's first class lounges in NY, DC, and Chicago. These lounges are a nice quiet refuge in the often-bustling train station. They have nice plush chairs, conference rooms, computer terminals, newspapers, TV's, free soft drinks, juices, coffee, tea and clean safe bathrooms. They also allow you to board your train before the rest of the masses.
The lounge in NY can be found to the far left of the NJ Transit ticket windows as you face them in the main Amtrak area. Walk past the West Gate for tracks 7 & 8 on the left side of the escalator and you will see a sign on the corner of the wall. There is a doorbell to the left of two gold doors. Ring the bell and wait for the click to open the door. Note: In NY there is no pre-boarding ahead of the regular passengers, but they usually do announce your train in the lounge before they announce it in the main station. This means if you don’t dilly-dally, you can generally be near the head of the line at the escalator.
In NY you'll need to show both your regional tickets, as well as your Capitol Limited tickets showing the sleeper. You shouldn't have any problems in NY, most of the agents there know the rules and won't hassle you. And the rules say that you are entitled to use any Amtrak lounge in the system on a day where you are traveling in First Class.
In DC the Club Acela Lounge is located behind the information kiosk, which is in the center of the waiting areas between gates D & E. There are two large wooden doors there, ring the bell to the right of the door and the attendant will let you in. Show your Capitol tickets and you’re in. They will escort you to your train when it’s time.
In Chicago the lounge is called the "Metropolitan Lounge". It is located on the lower level of Union Station, which is also the track level. If you are standing in front of the Amtrak ticket windows, then the Amtrak waiting area is to your left. When you enter the main Amtrak waiting area through a sliding glass door, just walk forward and slightly to the left. There should be another sliding glass door along with a sign, unless they've changed the entrance in the last few months. Again, just show your tickets and relax.
They'll also give you a card that contains the time that you need to return to the lounge by, in order to board the train and not miss it. If you do leave the lounge, take this card with you as it is also your pass for reentering the lounge. Just wave it at the attendants as you walk in and one will usually look up and acknowledge you and the card. Note the Chicago lounge can be very busy and it sometimes can be hard to get a seat, but you still get the free stuff and priority boarding.
Note: They will make you leave your carry-on bags in the luggage room inside the lounge, you cannot take them to your seat due to the crowded nature of the lounge. There is a redcap manning this room who will give you a claim check for your bags, such that you can claim them shortly before you board the train. One nice advantage of this is the fact that you can park your carryon bags here, while you wander around Chicago and do lunch, assuming that your trains arrive on time.