Noting that sleeper space on the Amtrak long distance trains is now in short supply and selling at a premium, a new Chicago company was formed that will add sleepers and diners to the Amtrak trains. They will not be private RR cars but cars put in service that would accommodate a number of passengers.
The service will start this October on trains from NYP to CHI and NOL.
See it here. http://www.travelpullman.com/