About: http://webisa.webdatacommons.org/303337538

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 cost of implementing PTC on public commuter railroads alone is estimated to exceed well over $2 billion, not including costs associated with acquiring the necessary radio spectrum or the subsequent software and operating expenses.
http://www.w3.org/ns/prov#wasQuotedFrom	apta.com