What is the {tied-arch bridge} for {maintained by} of {Amtrak}
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What is the name of the tied-arch bridge maintained by Amtrak?
SELECT DISTINCT ?w WHERE { ?w rdf:type ontology:tied-arch_bridge . ?w property:maintained_by resource:Amtrak }
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/P126> . ?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/Q818882> } 
 select distinct ?sbj where { ?sbj wdt:P126 wd:Q23239 . ?sbj wdt:P31 wd:Q818882 } 
Hell Gate Bridge