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 UCRY - Utah Central Railway UELX - United Equipment Leasing Associates; Archer Daniels Midland UECZ - Union Elevator Co. UEEZ - Union Equity Elevator Co. UEFZ - Union Equity 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 UPB - Union Pacific Railroad UPFE - Pacific Fruit Express; Union Pacific Railroad UPM - Union Pacific Railroad (Milwaukee Road directed operations) UPOZ - United Parcel Service UPP - Union Pacific Railroad (passenger cars) UPRQ - Union Pacific Railroad End Of Train Devices UPRX - Union Pacific Fruit Express Company UPS - Union Pacific Railroad (slugs) UPSZ - United Parcel Service UPT - Union Pacific Railroad (fuel tenders) UPWZ - United Parcel Service UPX - Union Pearson Express UPY - Union Pacific Railroad (yard switchers) URDX - United States Steel URR - Union Railroad (Pittsburgh, Pennsylvania) URTX - Union Refrigerator Transit Line; General American Transportation Corporation URY - Union Railway of Memphis USAX - United States Army USBX - GE Rail Services USCX - William G. Simon USEX - Evans Railcar Leasing Company USFU - United States Air Force USGX - Union Sugar Company USIX - US Industrial Chemicals Company USLF - Burlington Northern Railroad USLX - Evans Railcar Leasing Company; GE Capital Railcar Services USNX - United States Navy USPX - US Plastics Corporation USRX - U.S. Railways, Inc. USSX - United States Steel USWX - USA Waste Services UTAH - Utah Railway UTAX - Utah Transit Authority (formerly assigned to 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
References