# List of reporting marks: O

Note: Marks ending in U are for container owners; marks ending in X are not common carriers; marks ending in Z are for trailers without flanged wheels. All other marks are of common-carrier railroads.

## O

* OACX - Central Transportation, Inc.
* OAR - Old Augusta Railroad
* OCCU - ATS Container Leasing SA
* OCCX - Occidental Chemical Company
* OCE - Oregon, California and Eastern Railway
* OCEU - Oceanex Inc.
* OCFX - Owens Corning Fiberglass
* OCLU - Overseas Containers, Ltd.
* OCNU - Ocean Lines, Inc.
* OCPX - Occidental Chemical Company; Oxy Vinyls
* OCR - Oklahoma Central Railroad
* OCRR - Ottawa Central Railway
* OCRX - Oil Creek Refining Company
* OCSU - Scripps Institute of Oceanography
* OCTL - Oil Creek and Titusville Lines
* OCTR - Octoraro Railway
* OCTX - Octel America, Inc.
* ODTX - Oil-Dri Corporation of America
* OEDX - Ohio Edison Company
* OERX - Southern California Railway Museum
* OFCX - Ortner Freight Car Company
* OFOX - Residco
* OFSX - Tucson Electric Power Company
* OGEE - Ogeechee Railway
* OGEX - Oklahoma Gas and Electric Company
* OGSX - Iowa Southern Utilities Company
* OHCR - Ohio Central Railroad
* OHFX - Fluor Daniel Fernald
* OHIC - Ohi-Rail Corporation
* OHIO - Ohio Terminal Railway
* OHKU - Ohka American, Inc.
* OHOX - United States Department of Energy (Ohio Field)
* OHPA - Ohio and Pennsylvania Railroad
* OHRY - Owego and Harford Railway
* OILX - GE Rail Services
* OJGX - Oscar J. Glover
* OJTX - Tauber Transportation Company
* OKAN - Okanagan Valley Railway (OmniTRAX)
* OKCE - Okarche Central Railway
* OKCX - Lone Star Industries
* OKKT - Oklahoma, Kansas and Texas Railroad; Union Pacific Railroad
* OLAU - Occidental Chemical Corporation
* OLB - Omaha, Lincoln and Beatrice Railway
* OLDX - Old Line Holding Company, Inc.
* OLGX - Ineos Oligomers USA, LLC
* OLLU - Ocean Leasing, Ltd.
* OLNX - Olin Corporation
* OLO - Ontario L'Orignal Railway
* OLYR - Olympic Railroad
* OLYU - Olympic Container Corporation
* OLYR - Olympic Railroad
* OLYX - Olympia Petroleum, Inc.
* OLYZ - Showa Line, Ltd.
* OMAX - Omaha Public Power District
* OMID - Ontario Midland Railroad
* OMLP - Ohio Midland Light and Power
* OMLX - OmniTRAX Leasing, Ltd.
* OMNX - Omnisource; Steel Dynamics.
* OMRX - Ozark Mountain Railcar
* OMSX - Ohio Mulch; J. T. Leasing, Inc.
* ONCT - Ontario Central Railroad
* ONER - Ontario Eastern Railroad
* ONRR - Ohio and National Railway Company
* ONSX - Oglebay Norton Industrial Sands, Inc.
* ONT - Ontario Northland Railway
* ONTA - Ontario Northland Railway
* ONTX - On-Track Railcar Services, Inc.
* ONW - Oregon and Northwestern Railroad
* ONYX - American Colloid Company
* OOCZ - Orient Overseas Line, Inc.
* OOLU - OOCL
* OOOX - Osborne, Inc.
* OOUU - Orient Overseas Line, Inc.
* OPE - Oregon, Pacific and Eastern Railway
* OPIX - Equistar Chemicals
* OPPX - Omaha Public Power District
* OPR - Oregon Pacific Railroad
* OPSU - EMP
* OPSX - Public Service Company of Oklahoma
* OPT - Orange Port Terminal Railway
* OPX - Ohio Power Company
* OR - Owasco River Railway
* ORA - Ormet Railroad
* ORCU - BSL Transport
* OREX - Oregon Department of Agriculture
* OROX - United States Department of Energy (Oak Ridge Operations Office)
* ORR - Osage Railroad
* OSCZ - Intermodal Services, Inc.
* OSL - Oregon Short Line; Union Pacific Railroad
* OSRX - Ontario Southland Railway
* OSSU - Eurovos B.V.
* OTCO - Owensville Terminal Company
* OTCR - Oakdale Traction Corporation
* OTDX - Greenbrier Leasing Corporation
* OTPX - Otter Tail Power Company
* OTR - Oakland Terminal Railway
* OTRX - On-Track Railway Services, Ltd.
* OTSX - On-Track Railway Services, Ltd.
* OTT - Ottumwa Terminal Railroad
* OTTX - TTX Corporation
* OTVR - Otter Tail Valley Railroad (RailAmerica)
* OUCH - Ouachita Railroad
* OUCX - Orlando Utilities Commission
* OURD - Ogden Union Railway and Depot Company
* OVEX - Ohio Valley Electric Company
* OVNZ - Overnite Transportation Company
* OVO - Ottawa Valley Railway
* OVR - Ohio Valley Railroad
* OWIX - Old World Transportation, Ltd.
* OWLU - Ocean World Lines, Inc.
* OWSX - Oil Well Supply Company
* OWTX - Shamrock Coal Company
* OXYU - Eurotainer US, Inc.