U UBTX - Union Camp Corporation UCCX - Union Carbide Canada, Ltd. UCEX - Union Electric Company UCFX - Union Carbide Corporation UCLX - Vulcan Minerals Company UCOX - Union Carbide Corporation UCPX - Essem Corporation UCR - Utah Coal Route UELX - United Equipment Leasing Associates; Archer Daniels Midland UFIX - Utility Fuels, Inc. UIWX - Riley Stoker Corporation UMP - Upper Merion and Plymouth Railroad UMPX - Upper Merion and Plymouth Leasing Company UNI - Unity Railways UNCX - Union Carbide Canada, Ltd. UNPX - PROCOR UNSX - Unitrain Services UO - Union Railroad (Oregon) UOCX - General American Transportation Corporation UP - Union Pacific Railroad UPAX - United Power Association UPFE - Pacific Fruit Express; Union Pacific Railroad UPM - Union Pacific Railroad (Milwaukee Road directed operations) UPOZ - United Parcel Service UPP - Union Pacific Railroad UPRX - Union Pacific Fruit Express Company UPSZ - United Parcel Service UPWZ - United Parcel Service UPY - Union Pacific Railroad URDX - United States Steel URR - Union Railroad (Pittsburgh, Pennsylvania) URHX - United Railway Historical Societies of New Jersey URTX - General American Transportation Corporation URY - Union Railway of Memphis USAX - Département de la Défense des États-Unis USBX - GE Rail Services USCX - William G. Simon USEX - Evans Railcar Leasing Company USGX - Union Sugar Company USIX - US Industrial Chemicals Company USLF - Burlington Northern Railroad USLX - Evans Railcar Leasing Company; GE Capital Railcar Services USNX - Département de la Défense des États-Unis USPX - US Plastics Corporation USRX - U.S. Railways, Inc. USSX - United States Steel UTAH - Utah Railway UTAX - United Transportation, Inc. UTBX - Union Tank Car Company UTCX - Union Tank Car Company UTLX - Union Tank Car Company UTPX - Union Texas Petroleum Corporation UTR - Union Transportation UTTX - Trailer Train Company
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