These 4 Pullman Standard Fluted 6 Bedroom/Buffet Lounge Cars were delivered to New Haven in early '55 for service on the "Federal," "Montrealer," and "Washingtonian."  They were named and numbered:  550/Bay State, 551/Keystone State, 552/Nutmeg State, and 553/Pine Tree State.  They passed to Penn Central and were numbered 4433 to 4436.  They eventually went to Amtrak service.