Question: Who holds stock in the railway lines ending in Washington DC?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/routeEnd> <http://dbpedia.org/resource/Union_Station_(Washington,_D.C.)> . ?x <http://dbpedia.org/property/owner> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/RailwayLine>}