title: Liste des sigles de l'AAR débutant par U
text: # Liste des sigles de l'AAR débutant par U
  
  ## 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
  