Question: Where does the railway tracks start, which ends in Kazan?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/routeEnd> <http://dbpedia.org/resource/Kazan> . ?x <http://dbpedia.org/ontology/routeStart> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/RailwayLine>}