diff --git a/src/de/schildbach/pte/ZvvProvider.java b/src/de/schildbach/pte/ZvvProvider.java
index 5024da6e..72f9c7ba 100644
--- a/src/de/schildbach/pte/ZvvProvider.java
+++ b/src/de/schildbach/pte/ZvvProvider.java
@@ -103,7 +103,7 @@ public class ZvvProvider extends AbstractHafasProvider
 		throw new IllegalStateException("cannot normalize line " + line);
 	}
 
-	private static final Pattern P_NORMALIZE_LINE_S = Pattern.compile("S\\d+");
+	private static final Pattern P_NORMALIZE_LINE_S = Pattern.compile("SN?\\d+");
 
 	@Override
 	protected char normalizeType(final String type)