Rm corp owns these companies

RM ferries

Trans seaferry ships are MS alpha and MS beta

SeaFerries ships are MS reld and MS bilu

Gold Star Cruise Line ships unknown

Ward Cruise Lines ships are MS Starward, MS skyward, ms seaward, ms sunward, ms northward, ms southward, ms westward, ms eastward, ms queenward and ms kingward

and finally postmaster

Ship is TSS Achachikomako

That's it