What is the {tilting train} for {item operated} of {Amtrak}
Which tilting train is operated by Amtrak?
Who is the {tilting train} for {item operated} of {Amtrak}
SELECT DISTINCT ?m WHERE { resource:Amtrak property:item_operated ?m . ?m rdf:type ontology:tilting_train }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q23239> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P121> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q671188> } 
 select distinct ?obj where { wd:Q23239 wdt:P121 ?obj . ?obj wdt:P31 wd:Q671188 } 