# automatic block signaling

> railroad communications system

**Wikidata**: [Q1779202](https://www.wikidata.org/wiki/Q1779202)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Automatic_block_signaling)  
**Source**: https://4ort.xyz/entity/automatic-block-signaling


## References

1. [Source](https://lingualibre.fr/wiki/Q2315)
2. Freebase Data Dumps. 2013