fix: clean each drt network individually

src/main/java/org/matsim/run/prepare/PrepareNetwork.java

@@ -12,6 +12,7 @@
 import org.matsim.application.options.ShpOptions;
 import org.matsim.core.network.NetworkUtils;
 import org.matsim.core.network.algorithms.MultimodalNetworkCleaner;
+import org.matsim.core.network.algorithms.NetworkCleaner;
 import org.matsim.core.utils.geometry.geotools.MGC;
 import org.matsim.core.utils.gis.ShapeFileReader;
 import org.matsim.run.LeipzigUtils;
@@ -86,6 +87,12 @@ static void prepareDRT(Network network, ShpOptions shp) {
 			}
 		}
 
+		//we have to call the MultiModalNetworkCleaner for each mode individually, because otherwise the individual subnetworks might not get cleaned
+		MultimodalNetworkCleaner multimodalNetworkCleaner = new MultimodalNetworkCleaner(network);
+		for (String mode : modeGeoms.keySet()) {
+			multimodalNetworkCleaner.run(Set.of(mode));
+		}
+
 		log.log(Level.INFO, "The following modes have been added to the network: {}", modeGeoms.keySet());
 	}