With coach seating, the car is open with a center aisle and seats on either side. In 1st class there are two seats on one side of the aisle and one on the other. In 2nd class there are two seats on either side of the aisle. Night trains are for overnight travel and you should definitely consider sleeping accommodations such as a sleeper or couchette. Deluxe accommodations are available on the Talgo overnight trains between Spain, France, Switzerland and Italy.
Sleepers contain berths,with a private washstand, fresh linens and towels.
First class accomodates 1 or 2 people. Second class accommodates Top 10. Most train stations have lockers or luggage checkrooms for bag storage. When you're traveling on the train there are either overhead storage racks though out the car or luggage areas at each end of the car. Train stations are located within many European airports.