| AAAdvanced Aerospace Metals | Margate | FL | — | ◇ UNVERIFIED |
| AFAdvanced Flow Engineering INC | Corona | CA | — | ◇ UNVERIFIED |
| AIAerotek, INC. | Winder | GA | — | ◇ UNVERIFIED |
| APAir Pump Enterprises INC | Paramount | CA | — | ◇ UNVERIFIED |
| ARAlabama Railcar Service | Ozark | AL | — | ◇ UNVERIFIED |
| AHAlstom - Hornell Car Shop | Hornell | NY | — | ◇ UNVERIFIED |
| ARAlta Ready Mix INC | Walnut Grove | CA | — | ◇ UNVERIFIED |
| ARAmerican Railcar Industries | Marmaduke | AR | — | ◇ UNVERIFIED |
| AIAmsted Industries Company, INC. | Bessemer | AL | — | ◇ UNVERIFIED |
| ARAmsted Rail Company, INC. | Bessemer | AL | — | ◇ UNVERIFIED |
| AEAmtech Elevator Services | Cerritos | CA | — | ◇ UNVERIFIED |
| AIAndersons INC the - Danville Rail | Danville | IL | — | ◇ UNVERIFIED |
| AIAnsaldobreda, INC. | Dansville | NY | — | ◇ UNVERIFIED |
| ABApex Bulk Commodities INC | American Canyon | CA | — | ◇ UNVERIFIED |
| ATAppalachian Tank Car Services, INC. | Elk Mills | MD | — | ◇ UNVERIFIED |
| AIArcosa INC | Clinton | IL | — | ◇ UNVERIFIED |
| ASA. Stucki Company Incorporated | Sharon | PA | — | ◇ UNVERIFIED |
| ADA.stucki Dba Wheelworx | Calera | AL | — | ◇ UNVERIFIED |
| AAAvangrid at Lmc Industrial Contractors INC | Dansville | NY | — | ◇ UNVERIFIED |
| BCBach Composite Colorado, INC | Fort Lupton | CO | — | ◇ UNVERIFIED |
| BBBaker Bellfield LLC | Sacramento | CA | — | ◇ UNVERIFIED |
| BSBay Shore Systems Incorporated | Benicia | CA | — | ◇ UNVERIFIED |
| BIBc Installation Company | Paramount | CA | — | ◇ UNVERIFIED |
| BCBejac Corporation | Richmond | CA | — | ◇ UNVERIFIED |
| BCBenchmark Civil Construction INC | Napa | CA | — | ◇ UNVERIFIED |
| BBendetti | Colton | CA | — | ◇ UNVERIFIED |
| BRBirmingham Rail & Locomotive Co., INC. | Bessemer | AL | — | ◇ UNVERIFIED |
| BBBob Baker Trucking | Gualala | CA | — | ◇ UNVERIFIED |
| BBombardier | Orlando | FL | — | ◇ UNVERIFIED |
| BTBombardier Transportation Hold | Pittsburg | CA | — | ◇ UNVERIFIED |
| BTBombardier Transportation (holdings) USA INC. | Pittsburgh | PA | — | ◇ UNVERIFIED |
| BTBreda Transportation INC | Littleton | MA | — | ◇ UNVERIFIED |
| BEBrent Engineering | Elsinore | CA | — | ◇ UNVERIFIED |
| BEBrent Engineering INC | Menifee | CA | — | ◇ UNVERIFIED |
 Brookville Equipment Corporation | Brookville | PA | — | ◇ UNVERIFIED |
| BBBuilder's Best INC | Jacksonville | FL | — | ◇ UNVERIFIED |
| BWB W Services | Washington | IN | — | ◇ UNVERIFIED |
| CECal Electro INC | Redding | CA | — | ◇ UNVERIFIED |
| CPCalifornia Push Technologies | San Leandro | CA | — | ◇ UNVERIFIED |
| CRCathcart Repair Facilities, LLC | Elk Mills | MD | — | ◇ UNVERIFIED |
| CMC&c Manufacturing CORP Dba C&c Engineering | Meridian | CA | — | ◇ UNVERIFIED |
| CRCf Rail Services LLC | East Chicago | IN | — | ◇ UNVERIFIED |
| CRChemetron Railway Products | Pueblo | CO | — | ◇ UNVERIFIED |
| CRChemetron Railway Products INC. | Steelton | PA | — | ◇ UNVERIFIED |
| CHChicago Heights Railcar INC | Chicago Heights | IL | — | ◇ UNVERIFIED |
| CLChicago Locomotive Services LLC | Joliet | IL | — | ◇ UNVERIFIED |
| CEClover Equipment LLC | Anaheim | CA | — | ◇ UNVERIFIED |
| CECoastline Equipment | Long Beach | CA | — | ◇ UNVERIFIED |
| CSCoffman Specialties INC | Cabazon | CA | — | ◇ UNVERIFIED |
| CWColorado West Construction | Murrieta | CA | — | ◇ UNVERIFIED |
