List of reporting marks: UUUBTX - Union Camp CorporationUCCX - Union Carbide Canada, Ltd.UCEX - Union Electric CompanyUCFX - Union Carbide CorporationUCLX - Vulcan Minerals CompanyUCOX - Union Carbide CorporationUCPX - Essem CorporationUCR - Utah Coal RouteUCRY - Utah Central RailwayUELX - United Equipment Leasing Associates; Archer Daniels MidlandUECZ - Union Elevator Co.UEEZ - Union Equity Elevator Co.UEFZ - Union EquityUFIX - Utility Fuels, Inc.UIWX - Riley Stoker CorporationUMP - Upper Merion and Plymouth RailroadUMPX - Upper Merion and Plymouth Leasing CompanyUNI - Unity RailwaysUNCX - Union Carbide Canada, Ltd.UNPX - ProcorUNSX - Unitrain ServicesUO - Union Railroad UOCX - General American Transportation CorporationUP - Union Pacific RailroadUPAX - United Power AssociationUPB - Union Pacific RailroadUPFE - Pacific Fruit Express; Union Pacific RailroadUPM - Union Pacific Railroad UPOZ - United Parcel ServiceUPP - Union Pacific Railroad UPRQ - Union Pacific Railroad End Of Train DevicesUPRX - Union Pacific Fruit Express CompanyUPS - Union Pacific Railroad UPSZ - United Parcel ServiceUPT - Union Pacific Railroad UPWZ - United Parcel ServiceUPX - Union Pearson ExpressUPY - Union Pacific Railroad URDX - United States SteelURR - Union Railroad URTX - Union Refrigerator Transit Line; General American Transportation CorporationURY - Union Railway of MemphisUSAX - United States ArmyUSBX - GE Rail ServicesUSCX - William G. SimonUSEX - Evans Railcar Leasing CompanyUSFU - United States Air ForceUSGX - Union Sugar CompanyUSIX - US Industrial Chemicals CompanyUSLF - Burlington Northern RailroadUSLX - Evans Railcar Leasing Company; GE Capital Railcar ServicesUSNX - United States NavyUSPX - US Plastics CorporationUSRX - U.S. Railways, Inc.USSX - United States SteelUSWX - USA Waste ServicesUTAH - Utah RailwayUTAX - Utah Transit Authority UTBX - Union Tank Car CompanyUTCX - Union Tank Car CompanyUTLX - Union Tank Car CompanyUTPX - Union Texas Petroleum CorporationUTR - Union TransportationUTTX - Trailer Train Company