# Union Pacific Challenger

> five classes of American simple articulated 4-6-6-4 locomotives

**Wikidata**: [Q15700457](https://www.wikidata.org/wiki/Q15700457)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Union_Pacific_Challenger)  
**Source**: https://4ort.xyz/entity/union-pacific-challenger