| 1 | MIL | National Power Rail | | GB | TRAFFIC |
| 2 | MILA | MILLER, ARDEN TRANSPORT | | | SCAC4 |
| 3 | MILB | MILBURN UNIVERSAL DESIGNS | | | SCAC4 |
| 4 | MILC | MILLER OIL COMPANY | | | SCAC4 |
| 5 | MILD | MILLER, DAVID & SONS INC | | | SCAC4 |
| 6 | MILE | MILLER, L W DIVERSIFIED INC | | | SCAC4 |
| 7 | MILF | MILLER FREIGHTLINES LLC | | | SCAC4 |
| 8 | MILJ | MRO INTEGRATED LOGISTICS LLC | | | SCAC4 |
| 9 | MILL | MILLER TRANSPORT CO INC | | | PWRC |
| 10 | MILL | MILLENNIUM RELOCATION SERVICES INC | | | SCAC4 |
| 11 | MILLET | Millet SAS | Real: MISA | F | TRAFFIC |
| 12 | MILLI | Milli Bus Enterprise | | AFG | TRAFFIC |
| 13 | MILM | MINI-MILLS LTD | | | SCAC4 |
| 14 | MILN | MILNE TRUCK LINES INC | | | PWRC |
| 15 | MILN | MILLER TRUCKING INC | | | SCAC4 |
| 16 | MILO | MILESTOCK | | | SCAC4 |
| 17 | MILQ | MILLSOURCE INC | | | SCAC4 |
| 18 | MILS | MILLS TRANSFER, INC | | | SCAC1 |
| 19 | MILS | MOVE IT LOGISTICS INC | | | SCAC4 |
| 20 | MILU | CHICAGO, MILWAUKEE, ST. PAUL & | | | SCAC3 |
| 21 | MILU | CHICAGO, MILWAUKEE, ST. PAUL & | | | SCAC4 |
| 22 | MILW | Soo Line R.R. Co. | 1/1994-7/2005 | | NAKINA |
| 23 | MILW | The Milwaukee Road | added 7/1985; eliminated 4/1986 | | NAKINA |
| 24 | MILW | Chicago, Milwaukee, St. Paul and Pacific R.R. Co. | eliminated 7/1985 | | NAKINA |
| 25 | MILW | Chicago, Milwaukee, St. Paul and Pacific R.R. Co. (Richard B. Ogilvie, Trustee) | added 1/1981 | | NAKINA |
| 26 | MILW | Chicago, Milwaukee, St. Paul and Pacific R.R. Co. | 7/1936, 1/1941-10/1966 & 1/1975-1/1980; eliminated 1/1981 | | NAKINA |
| 27 | MILW | Chicago, Milwaukee, St. Paul and Pacific R.R. Co. | 1/52-10/66 & 1/75-1/80; eliminated 1/81 | | NRHS |
| 28 | MILW | Chicago, Milwaukee, St. Paul and Pacific R.R. Co. (Richard B. Ogilvie, Trustee) | added 1/81 | | NRHS |
| 29 | MILW | The Milwaukee Road | eliminated 4/86 | | NRHS |
| 30 | MILW | Soo Line R.R. Co. | 1/94-7/2000 | | NRHS |
| 31 | MILW | CANADIAN PACIFIC RWY [SOO LINE RAILROAD; CHICAGO, MILWAUKEE, ST. PAUL & PACIFIC RR (MILWAUKEE ROAD)] | | | PWRC |
| 32 | MILW | Chicago, Milwaukee, St. Paul and Pacific Railroad (Canadian Pacific Railway) | | | RSRV |
| 33 | MILW | MYRA INVESTMENTS LTD | | | SCAC4 |
| 34 | MILW | Chicago, Milwaukee, St. Paul and Pacific Railroad | | USA | TRAFFIC |
| 35 | MILX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 36 | MILX | General Electric Railcar Services Corp. | added 7/1993; 1/1994; eliminated 1/2000 | | NAKINA |
| 37 | MILX | Milpark Drilling Fluids | added 7/1988; eliminated 7/1993 | | NAKINA |
| 38 | MILX | Milchem Inc. | added 4/1982; eliminated 7/1988 | | NAKINA |
| 39 | MILX | Milchem Inc. | added 4/82; eliminated 7/88 | | NRHS |
| 40 | MILX | Milpark Drilling Fluids | added 7/88; eliminated 7/93 | | NRHS |
| 41 | MILX | General Electric Railcar Services Corp. | added 7/93; 1/94; eliminated 1/2000 | | NRHS |
| 42 | MILX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 43 | MILX | (NATX) GENERAL ELECTRIC RAILCAR SERVICES CORP. (MILPARK DRILLING FLUIDS [MILCHEM INC.]) | | | PWRC |
| 44 | MILX | Milchem (GE Rail Services Corporation) | | | RSRV |
| 45 | MILX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 46 | MILY | MILLER TRUCKING LTD | | | SCAC4 |
| 47 | MILZ | CANADIAN PACIFIC RAILWAY [SOO LINE RAILROAD] | | | PWRC |
| 48 | MILZ | Chicago, Milwaukee, St. Paul and Pacific Railroad (Canadian Pacific Railway) | | | RSRV |
| 49 | MILZ | SOO LINE RAILROAD | | | SCAC4 |
