What is the {railway station} for {owned by} of {Amtrak}
What is the railway station owned by Amtrak?
 select distinct ?sbj where { ?sbj wdt:P127 wd:Q23239 . ?sbj wdt:P31 wd:Q55488 } 
select distinct ?subj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?subj . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P127> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q23239> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q55488> } 
What is Amtrak's railway station?