What is the {station located on surface} for {uses} of {Amtrak}
What train stations used Amtrak technology?
What station used Amtrak technology  ?
SELECT DISTINCT ?j WHERE { resource:Amtrak property:uses ?j . ?j rdf:type ontology:station_located_on_surface }
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/P2283> . ?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/Q22808404> } 
 select distinct ?obj where { wd:Q23239 wdt:P2283 ?obj . ?obj wdt:P31 wd:Q22808404 } 
Winter Park