Union Pacific 3900 Series 4-6-6-4 Challenger drawings, engine only- Cylinder Details – Steam Chest Head – Back – Back Engine (3,4,5)
		SKU/Drawing Number: #323-CA-25046 C
			| Wheel Arrangement: | 4-6-6-4 | 
| Scale to 1 ft.: | 4” | 
| Drawing Title: | Cylinder Details – Steam Chest Head – Back – Back Engine (3,4,5) | 
| DWG. Size (in): | 30x23 |