| CAS | Cascade |
| CHL | Challenger Models |
| CUS | Custom Brass |
| GBF | Great Brass Fleet |
| HMK | Hallmark Models |
| KEY | Key Imports |
| KSM | Kirlin Scale Models |
| LAM | Lambert |
| MTS | MTS Imports |
| ORI | Oriental Models |
| OVL | Overland Models |
| PFM | Pacific Fast Mail |
| PRB | Precision Brass |
| PRS | Precision Scale |
| RYC | Railway Classics* |
| SHM | Shoreham Shops |
| SOH | Soho |
| SUN | Sunset Models |
| VH | Van Hobbies |
| W&R | W&R |
| * | Formerly Shoreham Shops |