Note: Marks ending in U are for container owners; marks ending in X are not common carriers; marks ending in Z are for trailers without flanged wheels. All other marks are of common-carrier railroads.

B

• BA - Boston and Albany Railroad; New York Central Railroad; Penn Central; Conrail
• BADX - Baden Investment Company
• BAEX - Farmers Elevator Company of Bondurant, IA; The Andersons
• BALX - Bayer Corporation
• BANU - Bank Winter and Co Aktiengesellschaft
• BAP - Butte, Anaconda and Pacific Railway
• BAPX - Bay Area Piggyback, Inc.
• BAR - Bangor and Aroostook Railroad; Montreal, Maine and Atlantic Railway
• BARU - Barons Leasing Corporation
• BARZ - Bangor and Aroostook Railroad; Montreal, Maine and Atlantic Railway
• BASF - BASF
• BASX - Bay State Milling Company
• BAWX - Babcock & Wilcox Company
• BAYL - Bay Line Railroad
• BAYU - Mobay Chemical Corporation
• BAYX - Union Tank Car Company; Bayer Corporation
• BAZX - Bay Chemical Company, Inc.
• BB - Buckingham Branch Railroad
• BBCX - BBC Brown Boveri, Inc.; ABB Power Generation, Inc.
• BBRX - Bombardier Inc. (Transportation Equipment Group)
• BBSZ - Barbar Steamship Lines, Inc.
• BBTU - Bress Bulk International Bulk Transport and Consulting
• BCAX - Blue Circle, Inc.
• BCCX - Border Chemical Company
• BCDX - Borden Chemical (a division of Borden, Inc.)
• BCE - British Columbia Hydro and Power Authority
• BCFX - GE Railcar Services Corporation
• BCGX - Bay Cities Gas Corporation
• BCH - British Columbia Hydro and Power Authority; Southern Railway of British Columbia
• BCIT - British Columbia Railway; Canadian National Railway
• BCIU - Bay Cities Leasing Company
• BCIX - Blue Circle, Inc.
• BCJU - Bay Cities Leasing Company
• BCK - Buffalo Creek Railroad; Conrail
• BCER - British Columbia Electric Railway
• BCLR - Bay Colony Railroad
• BCLU - Bibby Bros. Company
• BCMX - Bullet Concrete Materials Company
• BCNE - Canadian National Railway
• BCOL - British Columbia Railway; Canadian National
• BCPX - Brighton Corporation
• BCRR - Boyne City Railroad
• BCRX - GE Capital Rail Services
• BCRY - Barrie-Collingwood Railway
• BCTX - Boise Cascade
• BCTZ - Boise Cascade
• BCVX - West Coast Express
• BCWX - Union Tank Car Company
• BCYU - Bay Cities Leasing Company; Union Pacific
• BDCX - Anchor Glass Container
• BDLX - BDL Company
• BDMX - Blue Diamond Mining, Inc.
• BDNX - Baroid Division, NL Industries, Inc.; Baroid Drilling Fluids, Inc.
• BDRV - Belvidere and Delaware River Railway
• BDTL - Ballard Terminal Railroad
• BDW - Bighorn Divide and Wyoming Railroad
• BE - Baltimore and Eastern Railroad; Conrail
• BECX - FMC Corporation (Inorganic Chemicals Division)
• BEEM - Beech Mountain Railroad
• BEKR - Berks Rail Corporation
• BELX - Bell Processing, Inc.
• BENX - Bennett Lumber Products, Inc.; Investors Property Service
• BEPX - Coastal States Energy Company
• BFC - Bellefonte Central Railroad
• BFCF - Bremerton Freight Car Ferry
• BFCX - Berwick Freight Car Company
• BFFX - Berwick Forge and Fabrication Division Whittaker Corporation
• BFGX - B. F. Goodrich Company (Chemical Group); Oxy Vinyls, LP
• BFHU - Bailee Freight Services, Ltd.
• BFIX - Bethlehem Steel Corporation
• BFJR - Brillion and Forest Junction Railroad
• BFPX - Besse Forest Products
• BFRX - Bakery Trading Company
• BFSU - Bailee Freight Services, Ltd.
• BFTX - Bill Frank Rail Service
• BGCM - Bountiful Grain and Craig Mountain Railroad
• BGEX - General American Marks Company
• BGFX - Barnabas Group Foundation
• BGKU - Schering AG
• BGSX - Strata Corporation
• BH - Bath and Hammondsport Railroad; B and H Rail Corporation
• BHCR - Black Hills Central Railroad
• BHCU - Bridgehead Container Service
• BHP - BHP Nevada Railroad
• BHTX - Bernhart Crane and Rigging Company
• BHWY - Boot Hill and Western Railway
• BIAX - Ocala Recycling
• BICX - Beker Industries Corporation
• BIDU - Universal Bulk-Handling, Ltd.
• BIGX - Big Three Industries, Inc.; Air Liquide America Corporation
• BIRR - Bellingham International Railroad
• BISX - Brandenburg Industrial Service Company
• BITY - Penn Eastern Rail Lines, Inc.
• BJGX - BJ Gas Supply, Inc.
• BJHX - B. J. Hughes, Inc.; BJ Titan Services Company
• BJOX - Citicorp Railmark Inc. (Citirail)
• BJRY - Burlington Junction Railway
• BKLU - Bank Line Limited
• BKRR - Batten Kill Railroad
• BKRU - Baker Tanks
• BKTY - Missouri-Kansas-Texas Railroad; Union Pacific
• BLA - Baltimore and Annapolis Railroad
• BLCX - The Commonwealth Plan, Inc.
• BLE - Bessemer and Lake Erie Railroad
• BLHX - SMBC Rail Services
• BLKM - Black Mesa & Lake Powell Railroad
• BLKU - Bulkhaul Company
• BLKZ - Mid-American Intermodal Equipment Corporation
• BLMR - Blue Mountain Railroad
• BLOL - Bloomer Line
• BLU - Blue Ridge Southern Railroad
• BM - Boston and Maine Railroad; Pan Am Railways
• BMAZ - Better Asset Management; Transamerica Leasing
• BMCX - Bluewater Michigan Chapter, Inc.
• BMDX - GE Railcar Services Corporation
• BMDZ - Minnesota, Dakota and Western Railway
• BMEX - Brookville Equipment Corporation
• BMH - Beaufort and Morehead Railroad
• BMIZ - Burlington Motor Carriers
• BML - Belfast and Moosehead Lake Railroad
• BMRG - Blue Mountain and Reading Railroad
• BMS - Berlin Mills Railway; St. Lawrence and Atlantic Railroad
• BMSX - Bemis Company, Inc.
• BMT - Brooklyn–Manhattan Transit
• BMZ - Boston and Maine Railroad; Pan Am Railways
• BN - Burlington Northern Railroad; Burlington Northern and Santa Fe Railway; BNSF Railway
• BNAU - Burlington Northern and Santa Fe Railway; BNSF Railway
• BNAZ - Burlington Northern and Santa Fe Railway; BNSF Railway
• BNFE - Burlington Northern Railroad; Burlington Northern and Santa Fe Railway; BNSF Railway
• BNFT - Burlington Northern Railroad; Burlington Northern and Santa Fe Railway; BNSF Railway
• BNGR - Blackwell Northern Gateway Railroad
• BNIU - British and Irish Steam Packet Company
• BNML - Burlington Northern (Manitoba), Ltd.
• BNO - Burlington Northern and Santa Fe Railway; BNSF Railway
• BNOW - Burlington Northern (Oregon-Washington), Inc.
• BNPZ - Pacific Rail Services
• BNQ - Burlington Northern Railroad; Burlington Northern and Santa Fe Railway; BNSF Railway End Of Train Devices
• BNRQ - Burlington Northern and Santa Fe Railway; BNSF Railway
• BNRZ - Burlington Northern and Santa Fe Railway; BNSF Railway
• BNSF - Burlington Northern and Santa Fe Railway; BNSF Railway
• BNXU - Burlington Northern and Santa Fe Railway; BNSF Railway
• BNZ - Burlington Northern and Santa Fe Railway; BNSF Railway
• BO - Baltimore and Ohio Railroad; Chessie System; CSX Transportation
• BOBX - Freeman Gas of N.C., Inc.
• BOCT - Baltimore and Ohio Chicago Terminal Railroad; CSX Transportation
• BOCX - BOC Gases
• BOCY - Boat Company
• BOGU - BSL Transport
• BOMX - Baltimore and Ohio Railroad Museum
• BONU - Bond International, Ltd.
• BOP - Border Pacific Railroad
• BORX - US Borax, Inc.
• BORZ - Ecorail, Inc.
• BOSU - W. BOS Vloeistof Transport, B.V.
• BOZ - CSX Transportation
• BPAX - United States Department of Energy (Bonneville Power Administration)
• BPAZ - Acme Markets, Inc.
• BPCU - BP Chemicals Belgium
• BPCX - Basin Electric Power Cooperative
• BPIX - Nova Chemicals, Inc.
• BPLU - M1 Engineering, Ltd.
• BPLX - Nova Chemicals, Inc.
• BPOX - BP Amoco Chemical Company (BP Oil Division)
• BPPX - Brewster Phosphates of Bradley, Florida; General American Marks Company
• BPRC - Bergen Passaic Railway Corporation
• BPRR - Buffalo and Pittsburgh Railroad
• BPRX - Bergen Passaic Railway Corporation
• BPTR - Bergen Passaic Terminal Railroad
• BR - Bradford Industrial Rail
• BRAN - Brandon Corporation
• BRAX - Brae Corporation; CIT Group
• BRBX - Bombardier Transportation
• BRC - Belt Railway of Chicago
• BRCX - Bunge North America, Inc.
• BRCY - Cando Contracting, Ltd.^[1]
• BRE - Burlington Northern Railroad
• BREX - Big Rivers Electric Corporation
• BRG - Brownsville and Rio Grande International Railroad
• BRGX - Bridger Rail Shipping, LLC
• BRIX - Incobrasa Industries; Union Tank Car Company
• BRKX - Burke Energy Corporation
• BRLX - BRS Leasing Company
• BRNU - Brun, SA
• BRNZ - Comtrak
• BROU - Swedish Transocean Lines
• BRR - Battle River Railroad (formerly used by Belton Railroad)
• BRRC - Borinstein Railroad
• BRRX - Brooklyn Resource Recovery, Inc.
• BRSR - Blue Ridge Scenic Railway
• BRW - Black River and Western
• BS - Birmingham Southern Railroad
• BSCX - Bethlehem Steel Corporation
• BSDA - BSDA Railroad
• BSIX - Bethlehem Steel Corporation
• BSLU - Blue Star Line, Ltd.
• BSMX - Bay State Milling Company
• BSOR - Buffalo Southern Railroad
• BSPX - Otter Tail Power Company
• BSR - Big Spring Rail
• BSRR - Branford Steam Railroad
• BSRX - Branson Scenic Railway
• BST - Bi-State Transit; MetroLink
• BSTX - Trinitas Corporation
• BSVY - Boone and Scenic Valley Railroad
• BTAX - Big Three Lincoln-Alaska, Inc.; Air Liquide America Corporation
• BTC - Birmingham Terminal
• BTCO - Boston Terminal Company
• BTCU - Bulkmatic Transport Company
• BTCZ - Bulkmatic Transport Company
• BTEX - BTE Equipment
• BTLZ - Intermodal Services, Inc.
• BTRX - Rocky Mountain Transportation Services
• BTTX - Trailer Train Company; TTX Corporation
• BUDX - Budd Company
• BUDZ - Bud Antle
• BUGX - Bruggere and Monson
• BUKX - Louisville Gas and Electric Company
• BUNX - The Buncher Company
• BUNZ - Burnside International Trucks
• BVCX - West Coast Express
• BVHX - BV Heddrick Gravel and Sand Company
• BVRY - Brandywine Valley Railroad
• BVS - Bevier and Southern Railroad
• BWC - Berwind Corporation; Pennsylvania Railroad; Penn Central; Conrail
• BWCX - Borg-Warner Chemicals; GE Plastics
• BXBX - BXB Corporation
• BXN - Bauxite and Northern Railway
• BYCX - Battle Ground Yacolt and Chelatchie Prairie Railroad