About: http://webisa.webdatacommons.org/170858459

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	The testing frequency varies from one region to another, depending on such factors as tonnage, traffic type and density, rail age and previous defect rate.
http://www.w3.org/ns/prov#wasQuotedFrom	tsb.gc.ca