Lawgirl,

If you're in a sleeper on the Crescent, then you too are entitled to use the Club Acela in DC. Here's where to find it in Union Station:

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 right door and the attendant will let you in. Show your tickets and you’re in. They will escort you to your train when it’s time.