About: http://webisa.webdatacommons.org/11505436

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Signals took many forms, including whistle signals sent by the engineer, lantern signals sent by the train crew, and later block signals were added alongside the mainline tracks.
http://www.w3.org/ns/prov#wasQuotedFrom	railswest.com