Seaboard Coast Line
(click the link for history and photos of each car)
6800 C&O 1850
6801 C&O 1851
6802 C&O 1852
Also ran NP sleeper domes in 1967 on the joint Chicago-Florida "City of Miami" (domes painted into IC colors) and on joint Chicago-Flordia "Southwind" (domes remained in NP paint).