Locomotive Descriptions and Phases
Phases refer to incremental changes or improvements over a the production of a locomotive model. They generally indicate minor cosmetic differences and are thus rarely, if ever, used by railroads and builders. They are not official model designations.
Whenever possible, I have based phase information off existing, well-known phase descriptions. In some cases, I've modified the existing phases slightly based on my own observations. When I haven't been able to find existing phases, I've created my own. I include almost all phase differences in the drawings, except when it's not practical to draw them (such as with end plate differences in side views).
While I initially started only by listing basic phase details, I've gradually been expanding these pages into a more comprehensive guide that includes general production history, railroad-specific details, component variations, dimensions and measurements, and labelled illustrations. I've attempted to ensure the information is accurate and complete, but there may still be errors or omissions; please let me know if you find any!
- GP units
- SD units
- Switchers and cowl/carbody units