my family will be flying from NY to Chicago, then taking Amtrak from Chicago to LA. we booked two bedrooms with in-room showers. (one for us and one for the grandkids, but we were told the rooms are not in the same car?)

we've never been on Amtrak long distance trains. what kind of shower can we expect? are soap/shampoos provided or can we bring our own?

any advice appreciated!