Question: What railway lines go through the stations maintained by Western Australian Public Transport Authority?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/owningOrganisation> <http://dbpedia.org/resource/Public_Transport_Authority_(Western_Australia)> . ?x <http://dbpedia.org/ontology/servingRailwayLine> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Station>}