U

UAAX

American Acid Co.

8/1920-7/1923

UACX

Universal Atlas Cement Co.

7/1932; 1/1941-1/1952; eliminated 4/1953

UACX

Universal Atlas Cement Division of U.S. Steel Corp.

added 4/1964; eliminated 7/1965

UAIX

United Asphalts, Inc.

added 10/1992; 1/1994-7/2005; eliminated 1/2007; 7/2020 (not listed)

UASX

United Alloy Steel Corp.

7/1923

UAWX

Union Acid Works, Inc.
(Standard Wholesale Phosphate & Acid Works, Inc.)

7/1930-7/1935

UAWX

Standard Wholesale Phosphate & Acid Works, Inc.

7/1937-4/1947

UAWX

Mathieson Chemical Corp.

1/1950 (unlisted)

UBEX

United Bio Energy Ingredients, LLC

7/2005 (unlisted)

UBTX

Union Bag & Paper Corp.

added 7/1955; eliminated 10/1956

UBTX

Union Bag-Camp Paper Corp.

added 10/1956; 10/1957-7/1965; eliminated 7/1966

UBTX

Union Camp Corp.

added 7/1966; 10/1966-1/1980; eliminated 10/1987

UCBX

United Carbon Co., Inc.

7/1935-4/1961; eliminated 10/1963

UCBX

United Carbon Co.

added 10/1963; 7/1965-10/1966; eliminated 1/1969

UCBX

Ashland Chemical Co., Division of Ashland Oil & Refining Co., Carbon Black & Synthetic Rubber Division

added 1/1969; 4/1970; eliminated 4/1971

UCBX

Ashland Chemical Co., Division of Ashland Oil Inc., Carbon Black & Synthetic Rubber Division

added 4/1971; eliminated 7/1971

UCBX

Ashland Chemical Co., Division of Ashland Oil Inc.

added 7/1971; 1/1975; eliminated 1/1976

UCCX

Utah Copper Corp.

7/1937 (unlisted)

UCCX

United Contracting Co.

4/1947-4/1961 (unlisted)

UCCX

Union Carbide Canada Ltd.

added 10/1969; 4/1970-1/1980; eliminated 1/1985; 1/1994-7/2020 (unlisted)

UCEX

Union Electric Co.

added 10/1980; eliminated 10/1984; 1/1994 (unlisted); added 1/1997; eliminated 4/1997; 7/2000-7/2020 (unlisted)

UCFX

Union Carbide Corp.,
Chemicals and Plastics Operations Division

added 4/1971; 1/1975; eliminated 1/1979

UCFX

Union Carbide Corp., Chemicals and Plastics Division

added 1/1979; 1/1980; eliminated 7/1980

UCFX

Union Carbide Corp.

added 7/1980; eliminated 10/1980

UCFX

Union Carbide Corp., Chemicals and Plastics Division

added 10/1980; eliminated 5/1983

UCFX

Union Carbide Corp.

added 5/1983; eliminated 1/1993

UCFX

Union Carbide Chemicals and Plastics Co., Inc.

added 1/1993; 1/1994; eliminated 1/1995; eliminated 4/1995

UCFX

Union Carbide Corp.

added 1/1995; added 4/1995; 7/2000-7/2020

UCIR

Union County Industrial R.R. Co.

added 7/1996; 7/2000-7/2020

UCIX

Unichema Chemicals, Inc.

added 1/1986; 1/1994; eliminated 4/1996

UCKX

Union Coal & Coke Co. (Bethlehem Steel Co.)

8/1920-7/1923

UCLX

Union Chemical Carline, Inc.

added 7/1956; 10/1957-4/1970; eliminated 11/1973

UCLX

Vulcan Materials Co., Chemicals Division

added 11/1973; 1/1975-7/2005; eliminated 10/2005

UCLX

Basic Chemicals Co., LLC

added 1/2006; eliminated 4/2007

UCLX

Occidental Chemicals Corp.

added 4/2007; 7/2020

UCMX

United Commercial Co., Inc.

7/1930-4/1938

UCMX

United Clays, Inc.

added 7/1990; 1/1994-7/2000; eliminated 1/2002; 7/2005 (unlisted)

UCOX

Union Carbide Corp., Chemicals Division

added 7/1964; 7/1965-10/1966; eliminated 10/1967

UCOX

Union Carbide Corp., Chemicals and Plastics

added 10/1967; eliminated 1/1968

UCOX

Union Carbide Corp.,
Chemicals and Plastics Operations Division

added 1/1968; 4/1970-1/1975; eliminated 1/1979

UCOX

Union Carbide Corp., Chemicals and Plastics Division

added 1/1979; 1/1980; eliminated 7/1980

UCOX

Union Carbide Corp.

added 7/1980; eliminated 10/1980

UCOX

Union Carbide Corp., Chemicals and Plastics Division

added 10/1980; eliminated 5/1983

UCOX

Union Carbide Corp.

added 5/1983

UCOX

Union Carbide Corp., Chemicals and Plastics Co., Inc.

eliminated 1/1993

UCOX

Praxair, Inc.

added 1/1993; 1/1994; eliminated 4/1996; 7/2000 (unlisted); 7/2005-7/2020; eliminated 7/2021

UCOX

Linde Inc.

added 7/2021

UCPX

Union Carbide Chemicals Co.,
Division of Union Carbide Corp.

added 7/1961; eliminated 10/1963

UCPX

Union Carbide Corp., Chemicals Division

added 10/1963; 7/1965-10/1966; eliminated 10/1967

UCPX

Union Carbide Corp., Chemicals and Plastics

added 10/1967; eliminated 1/1968

UCPX

Union Carbide Corp.,
Chemicals and Plastics Operations Division

added 1/1968; eliminated 4/1969

UCPX

Essem Corp.

added 4/1969; 4/1970-1/1980; eliminated 7/1985

UCR

Utah Coal Route

8/1920-1/1980

UCRY

Utah Central Ry. Co.

added 1/1996; eliminated 4/1997; 7/2000-7/2005; added 7/2010; 7/2020

UCSX

Union Camp Corp.

added 10/1988; 1/1994-7/2000; eliminated 4/2002

UCSX

International Paper Co.

added 4/2002; 7/2005-7/2020

UCT

Indiana Business Railroad d/b/a Union City Terminal Railroad

7/2020

UCX

United Coal Co. (Hillman Coal & Coke Co.)

8/1920

UCX

United Coal Corp. (Cumberland & Pennsylvania R.R.)

8/1920

UCX

Uvalde Construction Co.

1/1941-4/1961 (unlisted)

UDAX

United Distillers of America, Inc.

1/1950

UDAX

North American Car Corp.

1/1952

UDIX

Utilities Distributors, Inc.

1/1943

UDIX

Utilities Transport Co.

1/1945

UDIX

Utilities Distributors Gas Co., Inc.

1/1946-1/1950

UDIX

Utilities Distributors, Inc.

1/1952; eliminated 7/1953

UDX

United Dairy Co.

7/1935

UDX

United Dairy Co., Inc.

7/1937-4/1938

UDX

United Dairy Co.

1/1941

UE

Union Electric Ry.

1/1946-7/1954

UELX

United Equipment Leasing Associates

added 7/1977; 1/1980; eliminated 4/1988

UELX

ADM Transportation Co.

added 4/1988; 1/1994-7/2020

UESX

Johnstown America Corp.

added 4/2002; 7/2005; eliminated 4/2011

UETX

UET RR, LLC

7/2020 (not listed)

UFGX

United Fuel Gas Co.

8/1920-7/1923; 1/1952-7/1954; eliminated 10/1954

UFIX

Utility Fuels, Inc.

added 7/1978; 1/1980-1/1994; eliminated 4/1994

UFIX

Houston Lighting & Power Co.

added 4/1994; eliminated 7/2000

UFIX

Reliant Energy HL&P

added 7/2000; 7/2000; eliminated 10/2004

UFIX

Texas Genco, LP

added 10/2004; eliminated 7/2005

UFIX

Texas Genco II, LP

added 7/2005; 7/2005; eliminated 10/2006

UFIX

NRG Energy, Inc.

added 10/2006; eliminated 4/2009; eliminated 7/2009

UFTX

Residco

added 7/2008; eliminated 10/2010

UFTX

David J. Joseph Co.

added 10/2010; 7/2020; eliminated 4/2023

UFTX

Nucor Logistics LLC

added 4/2023

UGPX

United Gas Pipe Line Co.

4/1938-1/1943

UGSX

United Gas Public Service Co.

7/1932-7/1937

UHRX

Upper Hudson River R.R. Corp.

7/2000 (unlisted); added 1/2003; eliminated 4/2003; 7/2005-7/2020 (unlisted)

UIC

Utah Idaho Central R.R. Co.

7/1923-7/1936

UIC

Utah Idaho Central R.R.

4/1938-7/1954

UIMX

United Iron & Metal LLC

7/2005-7/2020 (unlisted)

UIWX

Union Iron Works, subsidiary of Riley Stoker Corp.

added 1/1968; eliminated 4/1970

UIWX

Riley Stoker Corp.

added 4/1970; 4/1970-1/1994; eliminated 7/1998

UKKX

United Carbon Co.

7/1930-1/1941

ULCX

Unit Load Car Corp.

added 7/1959; 4/1961-4/1970; eliminated 10/1974

UMP

Upper Merion and Plymouth R.R. Co.

7/1954-7/2020

UMPX

Upper Merion & Plymouth Leasing Co.

added 4/1980; eliminated 4/1989

UMPX

Upper Merion and Plymouth Leasing Co.

added 4/1989; 1/1994

UMPX

Upper Merion and Plymouth Co.

eliminated 4/1996

UMPX

First Union Rail

added 4/1996; 7/2000-7/2005; eliminated 4/2016

UMPX

Wells Fargo Rail Corp.

added 4/2016; 7/2020

UNBX

Union Boiler Repair, Fabrication & Erection Co., Inc.

added 7/1970; eliminated 10/1972

UNBX

Union Boiler Repair

added 10/1972; eliminated 11/1973

UNBX

General Electric Railcar Services Corp.

added 4/1999; eliminated 1/2000

UNBX

General Electric Rail Services Corp.

added 1/2000; 7/2000-7/2005; eliminated 10/2015

UNCX

United Central Oil Corp. (Crown Central Petroleum Corp.)

7/1930

UNCX

Universal Car Co.

7/1935-4/1938

UNCX

Union Carbide Canada Ltd., Plastics & Chemicals

added 7/1981; eliminated 4/1987

UNCX

General Electric Railcar Services Corp.

eliminated 4/1992

UNCX

CGTX, Inc.

added 4/1992; 1/1994-7/2000; eliminated 4/2002

UNCX

GATX Rail Canada Corp.

added 4/2002; 7/2005; eliminated 10/2015

UNFX

American Railcar Industries

added 10/2006; 7/2020; eliminated 10/2020

UNFX

American Industrial Transport, Inc.

added 10/2020

UNI

Unity Railways Co.

1/1975-1/1980; eliminated 7/1986

UNIX

United Protective Car Co.

7/1935

UNIX

Unigas, Inc.

added 7/1962; 7/1965-4/1970; eliminated 7/1971

UNIX

Unified Environmental Services Group, LLC

7/2005-7/2020 (unlisted)

UNLX

The Board of Regents of the University of Nebraska

added 10/2007; eliminated 1/2020; 7/2020 (not listed)

UNPX

Union Petroleum Co.

8/1920-7/1923

UNPX

Union Petroleum Co. (Sinclair Refining Co.)

7/1930-7/1935

UNPX

Sinclair Refining Co.

7/1937-7/1954; eliminated 1/1958

UNPX

Union Tank Car Co.

10/1957; added 1/1958; 4/1961; added 7/1964; 7/1965-10/1966; added 1/1970; 4/1970; eliminated 1/1974

UNPX

Procor Ltd.

added 1/1974; 1/1975-7/2020

UNSX

Unitrain Services (agent for Iowa Power and Light Co.)

added 10/1980; eliminated 4/1993

UNSX

Midwest Power Systems

added 4/1993; 1/1994; eliminated 4/1996

UNSX

MidAmerican Energy Co.

added 4/1996; 7/2000; eliminated 4/2003

UNSX

JAIX Leasing Co.

added 4/2003; eliminated 1/2004

UNSX

Railcar Custom Leasing, LLC

added 1/2004; eliminated 10/2004

UNSX

Rail Logistics, LC

added 10/2004; 7/2005; eliminated 1/2014; 7/2020 (not listed)

UNTX

Unitrain, Inc.

added 10/1996; eliminated 4/1998

UNTX

MRC Rail Services, LLC

added 4/1998; 7/2000; eliminated 10/2003

UNTX

JAIX Leasing Co.

added 10/2003

UNTX

Railcar Custom Leasing, LLC

7/2005; eliminated 7/2007

UNTX

Macquarie Rail Inc.

added 7/2007; eliminated 4/2011

UNVX

Universal Corp.

added 10/1960; 4/1961; eliminated 1/1963

UNVX

Univar Canada Ltd.

added 4/2008; 7/2020

UO

Union R.R. of Oregon

1/1975; added 7/1979; 1/1980; eliminated 4/1986; eliminated 4/1989

UOCX

Union Oil Co. of California

8/1920-1/1952

UOCX

General American Transportation Corp.

7/1954-7/1965

UOCX

Union Oil Co. of California
(General American Transportation Corp.)

10/1966

UOCX

General American Transportation Corp.

4/1970-1/1994; eliminated 1/1998

UOCX

General American Marks Co.

added 1/1998; 7/2000-7/2005; eliminated 10/2015

UOEX

Union Oil Co. of California

added 10/1984; eliminated 1/1987

UOEX

UNOCAL

added 1/1987; eliminated 7/1992

UOEX

UNO-VEN

added 7/1992; 1/1994; eliminated 4/1998; 7/2000-7/2020 (unlisted)

UOGX

United Oil & Natural Gas Products Corp.

7/1923

UOKX

Union Oil Co. of Canada, Ltd. (Union Oil Co. of California)

7/1930-7/1935

UOKX

Union Oil Co. of Canada, Ltd.

7/1937-1/1945

UOKX

British American Oil Co. Ltd.

1/1946-4/1947

UOPX

Union Oil Co. of Pennsylvania

7/1923

UOPX

Union Oil Co. of Pennsylvania, Inc.

7/1937 (unlisted)

UOPX

UOP, A New York Partnership

added 1/1997; eliminated 7/1997; 7/2000-7/2020 (unlisted)

UP

Union Pacific R.R. Co.

4/1961-7/2020

UPAX

Utah Poultry Producers Cooperative Association
Refrigerator Line

7/1932

UPAX

Utah Poultry Producers Cooperative Association
Refrigerator Line (North American Car Corp.)

7/1935

UPAX

United Power Association

added 4/1982; 1/1994; eliminated 4/2000

UPAX

Great River Energy

added 4/2000; 7/2000-7/2005; eliminated 10/2005

UPCX

Universal Portland Cement Co.

7/1923

UPCX

Universal Portland Cement Co. (Universal Atlas Cement Co.)

7/1930-7/1935

UPCX

Universal Atlas Cement Co.

7/1937-4/1938

UPCX

Union Petroleum Corp.

added 1/1962; 7/1965-4/1970; eliminated 4/1974

UPCX

Home Petroleum Corp.

added 4/1974; 1/1975; eliminated 10/1979; 1/1980

UPCX

USPCI c/o Laidlaw Environmental Services, Inc.

added 10/1995; eliminated 4/1996

UPCX

Laidlaw Environmental Services, Inc.

added 4/1996; 7/2000; eliminated 4/2002

UPCX

Clean Harbors Environmental Sciences, Inc.

7/2005 (unlisted)

UPEX

United Gas Co. d/b/a United Pacific Energy

added 7/2016; 7/2020

UPFE

Union Pacific R.R. Co.

1/1975-7/2020

UPFX

United States Pipe and Foundry Co.

7/1935-1/1943

UPHE

Union Pacific Railroad Co.

7/2020

UPM

Union Pacific R.R. Co.

1/1980

UPP

Union Pacific R.R. Co. (passenger cars)

1/1994-7/2005

UPP

Union Pacific Railroad Co.

7/2020

UPPX

United Producers Pipe Line Co. (Transcontinental Oil Co.)

7/1930

UPR

Union Pacific R.R. Co.

1/1994-7/2020

UPRQ

Union Pacific Railroad Co.

7/2020

UPRX

Ultra-Penn Refining Co.

7/1932-7/1937

UPRX

Pennsylvania-Conley Tank Line,
a Division of General American Transportation Corp.

4/1938

UPRX

Union Pacific Fruit Express Co.

added 1/1978; 1/1980; eliminated 7/1984

UPX

Unity Petroleum Corp.

7/1937-1/1943

UPY

Union Pacific R.R. Co.

7/2000-7/2020

URC

United Railways Co. (Spokane, Portland & Seattle Ry.)

7/1923-7/1936

URC

United Railways Co.

4/1938-1/1941

URCX

United Refining Co.

8/1920-4/1970; eliminated 7/1971

URDX

United States Steel Corp., Resource Development Group

added 10/1980; eliminated 4/1985

URDX

Arch of Kentucky, Inc.

added 4/1985; 1/1994; eliminated 4/1994; 7/2000-7/2020 (unlisted)

URGX

UniCapital Rail Group

7/2000 (unlisted)

URMX

Union Refrigerator Transit Lines,
a Division of the General American Transportation Corp.

added 4/1964; 7/1965-10/1966; eliminated 7/1967

URMX

Unitrac Railroad Materials Inc.

7/2020 (not listed)

URR

Union R.R. Co. (Pittsburgh, PA)

1/1975-7/2005; eliminated 7/2017

URR

Union R.R. Co., LLC

added 7/2017; 7/2020

URTCo.

Union Refrigerator Transit Co.

7/1935

URTX

Union Refrigerator Transit Co. (previously U.R.T.Co.)

added 11/1934; 7/1935-4/1947

URTX

Union Refrigerator Transit Lines,
a Division of the General American Transportation Corp.

1/1950-4/1970; eliminated 10/1971

URTX

General American Transportation Corp., Freight Car Division

added 10/1971

URTX

General American Transportation Corp.

1/1975-1/1980; eliminated 10/1992

URY

Union Ry. of Memphis

1/1975-7/2020

USAX

United States Asphalt Refining Co.

8/1920-7/1923

USAX

Dept. of the Army, Office of the Chief of Transportation, Movements Division, Tank Car Section

1/1950-10/1957

USAX

Department of the Army,
Transportation Materiel Command, Marietta, Pennsylvania

eliminated 10/1955

USAX

Department of the Army, Transportation Supply and Maintenance Command, St. Louis 1, Missouri

added 10/1955

USAX

Dept. of the Army,
Transportation Supply and Maintenance Command

eliminated 7/1958

USAX

Dept. of the Army, U.S. Army Transportation Supply and Maintenance Command

added 7/1958

USAX

Dept. of the Army, Office of the Chief of Transportation, Movements Division, Tank Car Section

1/1952-10/1957; eliminated 4/1960

USAX

Dept. of Defense, Military Traffic Management Agency

added 4/1960; 4/1961; eliminated 4/1962

USAX

Dept. of Defense, Defense Traffic Management Service

added 4/1962; eliminated 7/1965

USAX

Dept. of Defense,
Military Traffic Management and Terminal Service

added 7/1965; 7/1965-4/1970; eliminated 10/1974

USAX

Dept. of Defense, Military Traffic Management Command

added 10/1974; 1/1975; eliminated 7/1975

USAX

Dept. of Defense, Troop Support and Aviation Material Readiness Command (intra-plant service)

1/1980; 1/1994-7/2005 (unlisted)

USAX

Department of Army, Military Traffic Management & Terminal Service

7/2020 (not listed)

USBX

U.S. Borax & Chemical Corp.

added 7/1964; 7/1965-10/1966; eliminated 1/1969

USBX

North American Car Corp.

added 7/1982; eliminated 1/1984

USBX

General Electric Railcar Services Corp.

added 1/1984; 1/1994; eliminated 4/1999

USBX

The CIT Group/Capital Finance, Inc.

added 4/1999; 7/2000-7/2005; eliminated 10/2018

USBX

The CIT Group/Equipment Financing Inc.

added 10/2018; 7/2020

USCX

United States Coal & Coke Co.

8/1920-7/1932

USCX

United States Tank Car Corp.

added 10/1972; eliminated 1/1975

USCX

William G. Simon, Trustee

added 1/1975; 1/1975; eliminated 7/1975

USCX

William G. Simon

added 7/1975; 1/1980-7/2000; eliminated 7/2003

USEX

United States Railway Equipment Co.

added 4/1955; 10/1957-1/1975; eliminated 7/1979

USEX

United States Leasing Co.

added 7/1979

USEX

United States Railway Leasing Co.

1/1980; eliminated 10/1980

USEX

Evans Railcar Leasing Co.

added 10/1980; eliminated 4/1988

USEX

Itel Rail Corp.

added 4/1988; eliminated 10/1992

USEX

General Electric Railcar Services Corp.

added 10/1992; 1/1994; eliminated 1/2000

USEX

General Electric Rail Services Corp.

added 1/2000; 7/2000-7/2005; eliminated 10/2015

USFX

U.S. Food Products Car Line Corp.

7/1923

USFX

Strick Division, Fruehauf Corp.

added 4/1961; 4/1961-7/1965; eliminated 7/1966

USGX

Union Sugar Co.

added 1/1982; eliminated 1/1987

USGX

Union Sugar Division, Holly Sugar Corp.

added 1/1987; added 7/1990

USGX

Holly Sugar Corp.

added 7/1990; 1/1994; eliminated 4/1994

USGX

U.S. Magnesium, LLC

added 10/2008; eliminated 1/2009; 7/2020 (not listed)

USIX

U.S. Industrial Alcohol Co.

7/1937-4/1938

USIX

U.S. Industrial Chemicals, Inc.

1/1941-1/1946

USIX

U.S. Industrial Chemicals Co.,
Division of National Distillers and Chemical Corp.

added 10/1977; 1/1980; eliminated 7/1987

USIX

USI Chemicals Co.,
Division of National Distillers & Chemical Corp.

added 7/1987; eliminated 7/1988

USIX

Quantum Chemical Corp., USI Division

added 7/1988; 1/1994; eliminated 4/1998

USIX

Equistar Chemicals, LP

added 4/1998; 7/2000-7/2005; eliminated 10/2007; eliminated 10/2015

USLD

Detroit, Toledo and Ironton R.R. Co.

4/1970-1/1980; eliminated 1/1980

USLF

St. Louis-San Francisco Ry. Co.

4/1970-1/1980; eliminated 1/1981

USLF

Burlington Northern Inc.

added 1/1981; eliminated 7/1981

USLF

Burlington Northern R.R. Co.

added 7/1981; eliminated 7/1985

USLX

United States Railway Equipment Co.

eliminated 10/1967

USLX

United States Railway Leasing Co.

added 10/1967; 4/1970; eliminated 1/1973

USLX

United States Railway Equipment Co.

added 1/1973; 1/1975; eliminated 7/1979

USLX

United States Leasing Co.

added 7/1979

USLX

United States Railway Leasing Co.

1/1980; eliminated 10/1980

USLX

Evans Railcar Leasing Co.

added 10/1980; eliminated 4/1988

USLX

Itel Rail Corp.

added 4/1988; eliminated 10/1992

USLX

General Electric Railcar Services Corp.

added 10/1992; 1/1994; eliminated 1/2000

USLX

General Electric Rail Services Corp.

added 1/2000; 7/2000-7/2005; eliminated 4/2016

USLX

Wells Fargo Rail Corp.

added 4/2016; 7/2020

USMX

U.S. Steel Mining Co., Inc.

7/2000-7/2020 (unlisted)

USNX

United States Navy

7/1935

USNX

United States Navy (Tanks), Bureau of S. & A.

7/1937-1/1950

USNX

Dept. of the Navy, Bureau of S. & A.

1/1952-10/1957; eliminated 4/1960

USNX

Dept. of Defense, Military Traffic Management Agency

added 4/1960; 4/1961; eliminated 4/1962

USNX

Dept. of Defense, Defense Traffic Management Service

added 4/1962; eliminated 7/1965

USNX

Dept. of Defense,
Military Traffic Management and Terminal Service

added 7/1965; 7/1965-4/1970; eliminated 10/1974

USNX

Dept. of Defense, Military Traffic Management Command

added 10/1974; 1/1975; eliminated 7/1975

USNX

Dept. of Defense,
Military Traffic Management Command (intra-plant service)

1/1980; 1/1994-7/2005 (unlisted)

USNX

Department of Army, Military Traffic Management & Terminal Service

7/2020 (not listed)

USOX

War Dept., U.S.A., Quartermaster Corps

1/1943

USOX

War Dept., U.S.A., Office of the Chief of Transportation

1/1945-4/1947

USOX

Dept. of the Army, Office of the Chief of Transportation, Movements Division, Tank Car Section

1/1950-1/1952

USOX

Dept. of the Army

added 7/1953

USOX

Dept. of the Army, Office of the Chief of Transportation, Railway Transport Service Division

7/1954

USOX

Department of the Army,
Transportation Materiel Command, Marietta, Pennsylvania

eliminated 10/1955

USOX

Department of the Army, Transportation Supply and Maintenance Command, St. Louis 1, Missouri

added 10/1955; eliminated 10/1956

USPX

U.S. Phosphoric Products Corp.

7/1935-4/1938

USPX

U.S. Phosphoric Products-Division Tennessee Corp.

1/1941-1/1946

USPX

U.S. Pipe and Foundry Co.

added 1/1960; 4/1961-10/1966; eliminated 4/1970

USPX

U.S. Plastics Corp.

1/1994-7/2005 (unlisted)

USQX

United States of America

7/1930-7/1932

USQX

United States of America
(War Department, U.S.A.)

7/1935

USQX

Quartermaster Corps, War Department, U.S.A.

7/1937-4/1938

USQX

War Dept., U.S.A., Quartermaster Corps

1/1941-1/1943

USQX

War Dept., U.S.A., Office of the Chief of Transportation

1/1945-4/1947

USQX

Dept. of the Army, Office of the Chief of Transportation, Movement Division, Tank Car Section

1/1950-1/1952

USQX

Dept. of the Army

added 7/1953

USQX

Dept. of the Army, Office of the Chief of Transportation, Railway Transport Service Division

7/1954

USQX

Department of the Army,
Transportation Materiel Command, Marietta, Pennsylvania

eliminated 10/1955

USQX

Department of the Army, Transportation Supply and Maintenance Command, St. Louis 1, Missouri

added 10/1955; eliminated 10/1956

USR

Utah Southern Railroad Company LLC

7/2020

USRX

United States Rubber Co.

7/1923-7/1937

USRX

United States Rubber Products, Inc.

4/1938

USRX

United States Rubber Co.

1/1941-10/1966; eliminated 7/1967

USRX

Uniroyal, Inc.

added 7/1967; eliminated 4/1968

USRX

U.S. Railcar, Inc.

1/1994 (unlisted)

USRX

US Railways Inc.

added 10/2003; eliminated 1/2004; 7/2005-7/2020 (unlisted)

USSX

United States of America

7/1923

USSX

United States Sugar Corp.

1/1943-4/1961; eliminated 1/1965

USSX

United States Steel Corp.

added 10/1977; 1/1980; eliminated 7/1987

USSX

Aristech Chemical Corp.

added 7/1987; eliminated 7/1988

USSX

United States Steel Corp.

added 1/2004; eliminated 7/2004; 7/2005-7/2020 (unlisted)

USTX

Union Starch & Refining Co.

7/1930-7/1965; eliminated 7/1966; eliminated 10/1966

USTX

General American Transportation Corp.

added 10/1966; 10/1966; eliminated 1/1968; 4/1970

USWX

USA Waste Services, Inc.

added 10/1996; eliminated 4/1997; 7/2000-7/2005 (unlisted)

USWX

USA Waste Services of NYC

7/2020 (not listed)

UT

Union Terminal Ry. of St. Joseph, MO

1/1941-1/1950

UT

Union Terminal Ry. Co.

1/1952-4/1970

UT

Union Terminal Ry. Co. (of St. Joseph, MO)

1/1975

UT

Missouri Pacific System

eliminated 1/1979

UTAH

Utah Ry. Co.

10/1957-7/2020

UTAX

United Transportation, Inc.

added 7/1972; 1/1975-1/1980; eliminated 7/1985

UTAX

Utah Transit Authority

7/2020 (not listed)

UTBX

Union Tank Car Co.

1/1975; added 4/1975; 1/1980-1/1994

UTCO

Union Traction Co.

7/1923-1/1941

UTCX

Union Tank Car Co.

7/1930-7/2020

UTLX

Union Tank Line Co. (Union Tank Car Co.)

8/1920-7/1935

UTLX

Union Tank Car Co.

7/1937-7/1965

UTLX

Union Tank Line Co. (Union Tank Car Co.)

10/1966

UTLX

Union Tank Car Co.

4/1970-7/2020

UTPX

Union Texas Petroleum Co.

1/1980

UTPX

Union Texas Petroleum Corp.

added 4/1980; eliminated 10/1984

UTPX

Union Texas Products Corp.

added 10/1984; eliminated 10/1986

UTPX

Suburban Propane Gas Corp.

eliminated 7/1988

UTPX

Suburban Propane-Division of Quantum Chemical Corp.

added 7/1988; 1/1994; eliminated 4/1997

UTPX

Suburban Propane L.P.

added 4/1997; 7/2000; eliminated 7/2003; 7/2005 (unlisted)

UTR

Union Transportation

1/1975-1/1980

UTTX

TTX Co.

added 7/1983; added 1/1992; 1/1994-7/2020

UTWX

Wildcat Midstream Limited Partnership

7/2020 (not listed)

UTX

Union Tank Car Co.

8/1920-4/1970; eliminated 7/1973

UUAX

Up-Up & Away, Inc.

1/1994 (unlisted); added 1/1997; eliminated 4/1997; 7/2000-7/2020 (unlisted)

UV

Unadilla Valley Ry.

7/1923-4/1970

UX

United States Fuel Co.

7/1930-7/1935