Prototype Accuracy
- A.C. Gilbert
- American Models
- Berlyn Locomotive Works
- Cascade Hobby Products
- Chama Model Shop & Gallery
- Foxhill Associates
- Leadville Designs
- Lionel
- NorthWest ShortLine
- Overland Models
- P-B-L
- Pacific Fast Mail
- Pacific Rail Shops
- Precision Scale Co
- Precision Vintage Classics
- Rio Grande Models
- River Raisin Models
- S-Helper Service
- The Leadville Shops
- Tomalco
- Triangle Scale Models
- Trout Creek Engineering
- Village Depot
- Wiseman Model Services