About: http://webisa.webdatacommons.org/46785820

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	I think you are out of luck, as PREMs as clearly stated on the SNCF site are nonexchangeable and nonrefundable; the insurance is normally just for extras such as meals or lost luggage or whatever if your train breaks down or is late.
http://www.w3.org/ns/prov#wasQuotedFrom	fodors.com