diff --git a/src/edu/kit/informatik/model/RollingStock.java b/src/edu/kit/informatik/model/RollingStock.java
index 783448e..cd555f3 100644
--- a/src/edu/kit/informatik/model/RollingStock.java
+++ b/src/edu/kit/informatik/model/RollingStock.java
@@ -3,8 +3,8 @@ package edu.kit.informatik.model;
 import edu.kit.informatik.ui.InvalidInputException;
 
 /**
- * A rolling stock. Is usually an engine, train set or coach.
- *
+ * A rolling stock with a specific integer length and couplings. Is usually an engine, train set or coach.
+ * 
  * @author Arne Keller
  * @version 1.0
  */
@@ -24,6 +24,7 @@ public abstract class RollingStock {
 
     /**
      * Initialize a rolling stock.
+     * 
      * @param length length of this rolling stock
      * @param couplingFront whether this rolling stock should have a front coupling
      * @param couplingBack whether this rolling stock should have a back coupling
@@ -43,6 +44,8 @@ public abstract class RollingStock {
     }
 
     /**
+     * Get the identifier of this rolling stock.
+     * 
      * @return identifier of this rolling stock
      */
     public abstract String getIdentifier();
diff --git a/src/edu/kit/informatik/model/Train.java b/src/edu/kit/informatik/model/Train.java
index 30a1562..86631c6 100644
--- a/src/edu/kit/informatik/model/Train.java
+++ b/src/edu/kit/informatik/model/Train.java
@@ -343,6 +343,7 @@ public final class Train {
 
     /**
      * Update the direction of this train.
+     *
      * @param newDirection new direction of the train
      */
     public void setDirection(final Vector2D newDirection) {
@@ -369,6 +370,8 @@ public final class Train {
     }
 
     /**
+     * Check if this train is on the specified position. This includes the front and back of the train.
+     *
      * @param point position to check
      * @return whether this train is on the specified position
      */
@@ -377,15 +380,18 @@ public final class Train {
     }
 
     /**
+     * Check if this train is on any of the provided positions. This includes the front and back of the train.
+     *
      * @param positions list of positions to check
      * @return whether this train is on any of the specified positions
      */
-    public boolean isOnAnyPosition(final List<Vector2D> positions) {
+    public boolean isOnAnyPosition(List<Vector2D> positions) {
         return position != null && position.stream().anyMatch(positions::contains);
     }
 
     /**
      * Calculate the length of this train, summing the length of all rolling stocks.
+     *
      * @return total length of this train
      */
     public long getLength() {