# Pennsylvania Railroad S1

> class of 1 American four-cylinder duplex 6-4-4-6 locomotive

**Wikidata**: [Q452277](https://www.wikidata.org/wiki/Q452277)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Pennsylvania_Railroad_class_S1)  
**Source**: https://4ort.xyz/entity/pennsylvania-railroad-s1


## References

1. Freebase Data Dumps. 2013