You won't have a Sightseer Lounge on the Cap Ltd between Pittsburgh and Chicago, but most of the trip is in the dark so it doesn't really matter, although this Train should have one so you're not a prisoner in your Room or Coach Seat.
As for Staff aboard your Trains,between Harrisburg and Pittsburgh, you'll only have a Conductor(s) and a Cafe attendant, on the Cap there will be a Sleeping Car attendant( SCA) in your Sleeper ( or a Coach Attendant if in Coach), a LSA to serve you Food and drink in the Diner/ Cafe ( called a Cross Country Cafe/ Combo Diner and Cafe-Lounge).
On the California Zepher ,Coast Starlight and Empire Builder ( between Portland and Spokand there is a Sightseer Lounge and you be served a Boxed Dinner/ the Diner is on the Seattle Section which joins the Portland Section in Spokane @ O Dark Thirty)you'll have a Real Diner, a Sightseer Lounge with the Cafe downstairs and either a SCA or Coach Atrendant .
All these Trains have Conductors and Engineers that change every few hours, the On Board Staff on the Long Distance Trains stay onboard for the whole route).