Union Pacific 3900 Series 4-6-6-4 Challenger drawings, engine only- Guides – Back Engine (3,4,5)
		SKU/Drawing Number: 503-CA-29984
			| Wheel Arrangement: | 4-6-6-4 | 
| Scale to 1 ft.: | 3” | 
| DWG. Size (in): | 30x21 | 
| Drawing Title: | Guides – Back Engine (3,4,5) |