| Articles in this category should be moved to subcategories when appropriate. |
This category may require frequent maintenance to avoid becoming too large. It should list very few, if any, article pages directly and should mainly contain subcategories.
Engines grouped by the manufactures 'Nominal' nhp rating.
- These are NOT the actual power of the engines listed & some sources may list them differently so individual engines may be in more than one category.
- Category:Steam engines by weight class - a listing of engines sorted by the manufacturers nominal weight class of the engine.