Typical consist would be two Amtrak P42 engines, 1 heritage baggage car, 2 or 3 Viewliner sleepers, 1 heritage dining car, 1 cafe car or perhaps a Diner Lite car serving as a cafe, 3 or 4 Amfleet II coaches.
Now depending on just when in November you are traveling, you may see a bigger than normal train. Starting on November 6th for about two months, Amtrak is partnering with GrandLuxe Rail Journeys, to provide a special premium service between Washington and Miami, with two intermediary stops at Orlando and West Palm Beach. This partnership will see an additional 7 luxury cars attached to the train. All reports indicate that these special cars will be at the head end of the train, directly behind the engines.
You will not be able to visit these cars, as they will only allow the paying guests who have reserved space in those special cars into that section of the train.
Usually the stop in DC is about 20 to 30 minutes, but it can be shorter or longer depending on the arrival time.