Where do the railroads owned by the Chicago and Northwestern Transportation company begin?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/system> <http://dbpedia.org/resource/Chicago_and_North_Western_Transportation_Company> . ?x <http://dbpedia.org/ontology/routeStart> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/RailwayLine>}
Chicago_and_North_Western_Transportation_Company