| IMP |
NAME |
DATES |
|---|
| 3rd | 3rd Rail Division of Sunset Models | Current |
| AHM | Associated Hobby Manufacturers | 1962-1978 |
| AKA | Akane Model Railroad Company | 1958-1964 |
| ALC | ALCO Models | 1967-1983 |
| ALP | Alpha Brass | 1984-1985 |
| AMB | American Brass | 1981-1986 |
| ARI | Aristo-Craft Distinctive Miniatures | 1957-1966 |
| ASM | Associated Models | 1956 |
| ASM | Athabasca Scale Models Limited | Current |
| AUS | Australian Locomotive Company | . |
| AWE | A.W. Enterprises, Inc. | ca. 1999 |
| BAL | Balboa Scale Models | 1964-1974 |
| BBM | Berg's Brass Models | . |
| BBM | Berg's Brass Models | 1969-Date |
| BCM | Beaver Creek Models | 1988-1989 |
| BIM | Beach Island Manufacturing Co. | . |
| BLW | Berlyn Locomotive Works, Inc. | . |
| CAS | Cascade Models | . |
| CB | Custom Brass (N.J. International) | 1972-1985 |
| CCM | Classic Construction Models | 1989-Date |
| CIL | Challenger Imports, Ltd. | 1990-2005 |
| CLS | Car & Locomotive Shop | Currernt |
| CLW | Central Locomotive Works | ca. 2004 |
| CMC | Llassic Mint Collectibles | Current |
| CON | Continental Models | 1958-1959 |
| CY | The Coach Yard | Current |
| DIM | Diamond Models | 1964-1965 |
| DVP | Division Point, Inc. | 1999-Date |
| E&P | E&P Associates | . |
| EGL | Eagle Imports | 2002-2003 |
| EMP | Empire Midland Model Company | 1978-1980 |
| ERL | Erie Limited | ca. 1992 |
| ESC | ESCMRA Company | 1990-1991 |
| F&G | Frew & Gordon, Ltd. | 1964-1967 |
| FAM | Fine Art Models | Current |
| FED | Far East Distributors | 1971-1976 |
| FLZ | Flying Zoo | 1983-1989 |
| FOM | Fomras Brass Models (Japan) | 1981-Date |
| FTM | Fairfield Traction Models | 1967-1980 |
| FUL | Fulgerex (Swiss) | . |
| GBF | Great Brass Fleet | 1980-1990 |
| GEM | Gem Models | 1958-1982 |
| GHB | G.H.B. International | 1980-1989 |
| GHC | G.H.C. Company | ca. 1959 |
| GPM | Glacier Park Models | Current |
| GSB | G.S.B. Rail, Ltd. | ca. 1983 |
| GWL | Great Western Locomotive Works | . |
| H4W | House of Four Winds | ca. 1959 |
| HAL | Hallmark Models, Inc. | 1968-1988 |
| HIC | High Country Brass | . |
| HIT | David Hitt | . |
| HMW | Huntington Model Works | ca. 1968 |
| HOT | HO Train Company | ca. 1962 |
| IHM | Iron Horse Models (PSC) | Current |
| IML | Imperial Models | . |
| IMP | International Model Products | 1954-1960 |
| INT | International Models, Inc. | 1950-1962 |
| JL | Joint Line | 1995-1997 |
| JMS | J.M.S. Industries | ca. 1975 |
| JOW | Joe Works | 1982-1983 |
| KAW | Kaw Valley Scale Models | ca. 1965 |
| KEM | Kemtron | ca. 1957 |
| KEN | Ken Kidder Railroad Models | 1956-1971 |
| KEY | Key Imports | 1975-2008 |
| KIR | Kirlin Scale Models | . |
| KMB | Kiss Modellbahnen (Germany) | . |
| KMI | Key Model Imports | 2008- |
| KOH | Kohs & Company, Inc. | Current |
| KOP | Koppel | . |
| LAM | Lambert Associates | 1970-1979 |
| LEM | Lemaco - now Lematec (Swiss) | . |
| LMB | L.M. Blum Models | 1958-1984 |
| LMC | Lematec - formerly Lemaco (Swiss) | Current |
| MAX | Max Gray | 1962-1965 |
| MBA | M.B. Austin | 1956-1966 |
| MCW | Milwaukee Car Works | ca. 1980 |
| MDW | Models West | 1971-1984 |
| MDX | ModX (G.Series) Nickle Plate Prod. | 1984-1985 |
| MET | Metro Models | . |
| MEW | Model Engineering Works | 1960-1972 |
| MMK | Micro-Metakit (Germany) | Current |
| MTL | Model Traction Lines | ca. 1964 |
| MTM | Midwest Trolley Museum, Inc. | ca. 1977 |
| MTR | Model Tramway System | . |
| MTS | MTS Imports | Current |
| NBL | The North Bank Line | 2008-Date |
| NER | New England Rail Service | 1985-1989 |
| NOR | Northern Imports | 1981-1983 |
| NOZ | Nozawa | . |
| NPP | Nickle Plate Products | 1972-1987 |
| NWI | Northwest Imports | . |
| NWS | Northwest Short Line | 1959-1980 |
| O&W | O&W Car Company | . |
| OLX | Olympic Express | ca. 1960 |
| OMI | Overland Models, Inc. | Current |
| ORI | Oriental Limited | 1979-1989 |
| OWS | Original Whistle Stop, Inc. | . |
| PBL | PBL Brass | . |
| PCC | Palace Car Company | . |
| PCH | Pro Custom Hobbies | ca. 1986 |
| PCM | Precision Craft Models | Current |
| PFM | Pacific Fast Mail | 1954-Date |
| PPK | Pacific Pike (F&G) | 1964-1966 |
| PRB | Pecos River Brass | . |
| PRG | Paragon Models | Ca. 1958 |
| PRM | Precision Miniatures | Ca. 1961 |
| PSC | Precision Scale Company, Inc. | 1979-Date |
| PSM | Perfect Scale Models | Ca. 1967 |
| PTR | Pacific Traction | 1967-1968 |
| QCC | Q-Car Company | . |
| RCL | Rail Classics | 2000-2004 |
| RED | Red Ball | 1962-1972 |
| RWC | Railway Classics | 2000-2004 |
| RWK | Railworks | 1989-2004 |
| RYM | RY Models (Rich Yoder) | . |
| SHD | Sattler's HO Depot | Ca. 1960 |
| SHH | Signal House Hobbies | Ca. 1974 |
| SND | Sun Dancer | Ca. 1988 |
| SOH | S. Soho & Company | 1969-1978 |
| SSL | Shorham Shops, Ltd. | 1998-2000 |
| SSS | South Shore Scale Models | . |
| SUN | Sunset Models, Inc. | 1975-Date |
| SYD | E. Suydam & Company | 1957-1976 |
| TAK | Takara | Ca. 1961 |
| TCW | The Car Works | Current |
| TEN | Tenshodo | 1949-Date |
| TMS | Tetsudo Mokei Sha | . |
| TOM | Tomalco | . |
| TRN | Trains, Inc. | 1966-1969 |
| TSS | Trackside Specialties | 1966-1968 |
| UNK | Unknown | . |
| USH | U.S. Hobbies | . |
| UTI | Union Terminal Imports, LLC. | 2008-Date |
| VAN | Van Hobbies, Inc. (Canada) | 1973-Date |
| W&R | W&R Enterprises | Current |
| WAS | Western Aero Supply | Ca. 1957 |
| WMC | Westside Model Company | 1964-1982 |
| WPC | W.P. Car Corporation | . |