| LMLoram Maintenance of Way Inc (Georgetown) | Georgetown | TX | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| LLLRS Logistics | Boaz | AL | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| MMascot | Mascot | TN | Transportation Equipment Manufacturing336510 | 100-499 | ◐ LIKELY ACTIVE |
| MKMayfield KY Locomotive | Mayfield | KY | Transportation Equipment Manufacturing336510 | 100-499 | ◐ LIKELY ACTIVE |
| MTMcMinnville, TN | Mcminnville | TN | Transportation Equipment Manufacturing336510 | 1-19 | ◐ LIKELY ACTIVE |
| M8Mechanicsville - 8440 Times Dispatch Blvd | Mechanicsville | VA | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| MTMemphis TN Trackworks | Memphis | TN | Transportation Equipment Manufacturing336510 | 1-19 | ◐ LIKELY ACTIVE |
| MMeppi110-116 | Freedom | PA | Transportation Equipment Manufacturing336510 | 100-499 | ◐ LIKELY ACTIVE |
| MMeppi55 | Melville | NY | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| MAMid America Car, Inc. | Kansas City | MO | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| MRMiddletown Recycling | Middletown | OH | Transportation Equipment Manufacturing336510 | 1-19 | ◐ LIKELY ACTIVE |
| MRMobile Rail Take Up | Albertville | AL | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| MCMojave CA Wheelshop | Mojave | CA | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| NYNew York Air Brake - Premtec | Salisbury | NC | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| NNNorthport NE Car Shop | Bridgeport | NE | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| NMNRE Mt. Vernon | Mount Vernon | IL | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| NSNRE Silvis | Silvis | IL | Transportation Equipment Manufacturing336510 | 1-19 | ◐ LIKELY ACTIVE |
| OCOak Creek | Oak Creek | WI | Electrical Equipment, Appliance & Component Manufacturing335312 | 100-499 | ◐ LIKELY ACTIVE |
| ONOmaha NE Signaling | Omaha | NE | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| OTOmaha Track Equipment | Omaha | NE | Transportation Equipment Manufacturing336510 | 1-19 | ◐ LIKELY ACTIVE |
| OTOmaha Track Equipment KC | Kansas City | MO | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| PGPatterson GA Locomotive | Patterson | GA | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| PIPeru IN Locomotive Components | Peru | IN | Transportation Equipment Manufacturing336510 | 100-499 | ◐ LIKELY ACTIVE |
| PSPickering Street | Brookville | PA | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| PPPittsburgh, PA | Pittsburgh | PA | Printing and Related Support Activities323111 | 20-99 | ◐ LIKELY ACTIVE |
| PMPMC Muncie IN Locomotive | Muncie | IN | Transportation Equipment Manufacturing336510 | 500+ | ◐ LIKELY ACTIVE |
| PMPowerRail Manufacturing, Inc. | Connersville | IN | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| PCPueblo CO Weld Plant | Pueblo | CO | Transportation Equipment Manufacturing336510 | 1-19 | ◐ LIKELY ACTIVE |
| RTRail Tech Leasing & Manufacturing | University Park | IL | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| RPReading PA Trackworks | Reading | PA | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| RTRepublic Transportation Systems INC | Greenville | SC | Transportation Equipment Manufacturing336510 | — | ◐ LIKELY ACTIVE |
| RPRidgefield Park, NJ | Ridgefield Park | NJ | Transportation Equipment Manufacturing336510 | 1-19 | ◐ LIKELY ACTIVE |
| RMRiverside MO Distribution | Riverside | MO | Transportation Equipment Manufacturing336510 | 1-19 | ◐ LIKELY ACTIVE |
| RVRoanoke VA Recycling | Roanoke | VA | Transportation Equipment Manufacturing336510 | 1-19 | ◐ LIKELY ACTIVE |
| RRRoaring River, NC | Roaring River | NC | Transportation Equipment Manufacturing336510 | 1-19 | ◐ LIKELY ACTIVE |
| SRSA Rail, LLC | Maumee | OH | Transportation Equipment Manufacturing336510 | 1-19 | ◐ LIKELY ACTIVE |
| SKSatanta, KS | Satanta | KS | Transportation Equipment Manufacturing336510 | 1-19 | ◐ LIKELY ACTIVE |
| SFSebring, FL | Sebring | FL | Transportation Equipment Manufacturing336510 | 1-19 | ◐ LIKELY ACTIVE |
| STSherman Tx Trackwork | Sherman | TX | Transportation Equipment Manufacturing336510 | 100-499 | ◐ LIKELY ACTIVE |
| SNSidney NE Wheelshop | Sidney | NE | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| SMSiemens Mobility Rolling Stock French Road | Sacramento | CA | Transportation Equipment Manufacturing336510 | 500+ | ◐ LIKELY ACTIVE |
| SESnyder Equipment Springfield | Springfield | MO | Transportation Equipment Manufacturing336510 | 100-499 | ◐ LIKELY ACTIVE |
| SLSt. Louis, MO | St. Louis | MO | Transportation Equipment Manufacturing336510 | 1-19 | ◐ LIKELY ACTIVE |
| SLSt. Louis, MO | Saint Louis | MO | Transportation Equipment Manufacturing336510 | 1-19 | ◐ LIKELY ACTIVE |
| SIStrato, Inc | Monmouth Junction | NJ | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| STStrato Transit Components, LLC | Eagle Bridge | NY | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| SNSyracuse, Ny | Syracuse | NY | Paper Manufacturing322211 | 1-19 | ◐ LIKELY ACTIVE |
| TITalgo, Inc. | Milwaukee | WI | Transportation Equipment Manufacturing336510 | 100-499 | ◐ LIKELY ACTIVE |
| TRTrinity Rail Maintenance Services | Saginaw | TX | Transportation Equipment Manufacturing336510 | 100-499 | ◐ LIKELY ACTIVE |
| TRTrinity Rail Maintenance Services #4034 | Jonesboro | AR | Transportation Equipment Manufacturing336510 | 100-499 | ◐ LIKELY ACTIVE |