About: http://webisa.webdatacommons.org/166904192

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 vehicles are wider towards the bottom and filled with sand or other ballast and include sliding rollers or balls e embedded in the bottom surface of the vehicles to facilitate sliding on the platforms.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr