Union Station is located @ 50 Mass Ave. NE so use the Front Entrance after being dropped off! You can also ride Amtrak trains, VRE and MARC Commuter Trains and Metro Subway and Buses to reach it! The Greyhound Station and other buses also are located in the Parking Garage by the Station.
Club Acela is located behind Gate C on the Main Concourse behind the Amtrak Ticket Counters, look for the Brown wooden Doors, you ring the buzzer to gain admission.( You'll come in the Front Doors, pass all the various stores, restaurants etc.in the front room, pass the Amtrak Ticket Counters to the Main Concourse where the Boarding Gates are. The food court us located in the Basement and the Upscale Mall is on several levels all around you.
Tell the Lounge Agent @ the desk when you check in that you want a Red Cap to board, they will cone and get you about 30 minutes before General Boarding inside the Lounge and take you to your train. The Cap Ltd. Is rather far from the lounge so they'll take you on a Cart with your Luggage. Since thete are so many of you, a $10 tip would be appreciated!
They'll take you and your Luggage right to your room on the train! Be sure and have your tickets scanned by the Conductor so your continuing rez isn't canceled.
As for Meal reservations, you'll need a Dinner Rez/ the Diner LSA will come to your car to let you pick you your time. You might want to mention that to your SCA( Sleeping Car attendant,) their Roomette is #1 upstairs next to the Bathroom) when boarding your car, they will great you as you board.
Breakfast will be first come, first served starting @ 630am,usually after the stop in Toledo. The earlier the better if you don't want to have to get on a waiting list!
As for what time to arrive @ Union Station I'd say that arriving no later than 230pm would be prudent, 215 pm would be even better, you'll have the Lounge to wait in and the Red Caps will get you to the train before General boarding by the Coach Passengers.
You'll have the bedding and linens you need with your room, but if it gets too cold your SCA will provide additional blankets, pillows, towels etc. upon request.