diff --git a/src/edu/kit/informatik/model/Train.java b/src/edu/kit/informatik/model/Train.java
index 13081be..11242a5 100644
--- a/src/edu/kit/informatik/model/Train.java
+++ b/src/edu/kit/informatik/model/Train.java
@@ -17,6 +17,11 @@ import java.util.stream.Collectors;
  * @version 1.1
  */
 public final class Train {
+    /**
+     * Separator between rolling stocks in {@link #show()}.
+     */
+    private static final char ROLLING_STOCK_SEPARATOR = ' ';
+
     /**
      * Numerical identifier of this train.
      */