diff --git a/doc/classdiagram.graphml b/doc/classdiagram.graphml
new file mode 100644
index 0000000..3e53e8a
--- /dev/null
+++ b/doc/classdiagram.graphml
@@ -0,0 +1,98 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<graphml xmlns="http://graphml.graphdrawing.org/xmlns" xmlns:java="http://www.yworks.com/xml/yfiles-common/1.0/java" xmlns:sys="http://www.yworks.com/xml/yfiles-common/markup/primitives/2.0" xmlns:x="http://www.yworks.com/xml/yfiles-common/markup/2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:y="http://www.yworks.com/xml/graphml" xmlns:yed="http://www.yworks.com/xml/yed/3" xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns http://www.yworks.com/xml/schema/graphml/1.1/ygraphml.xsd">
+  <!--Created by yEd 3.19-->
+  <key attr.name="Beschreibung" attr.type="string" for="graph" id="d0"/>
+  <key for="port" id="d1" yfiles.type="portgraphics"/>
+  <key for="port" id="d2" yfiles.type="portgeometry"/>
+  <key for="port" id="d3" yfiles.type="portuserdata"/>
+  <key attr.name="url" attr.type="string" for="node" id="d4"/>
+  <key attr.name="description" attr.type="string" for="node" id="d5"/>
+  <key for="node" id="d6" yfiles.type="nodegraphics"/>
+  <key for="graphml" id="d7" yfiles.type="resources"/>
+  <key attr.name="url" attr.type="string" for="edge" id="d8"/>
+  <key attr.name="description" attr.type="string" for="edge" id="d9"/>
+  <key for="edge" id="d10" yfiles.type="edgegraphics"/>
+  <graph edgedefault="directed" id="G">
+    <data key="d0"/>
+    <node id="n0">
+      <data key="d4" xml:space="preserve"/>
+      <data key="d5"/>
+      <data key="d6">
+        <y:UMLClassNode>
+          <y:Geometry height="244.90625" width="174.21875" x="128.0" y="108.0"/>
+          <y:Fill color="#FFCC00" transparent="false"/>
+          <y:BorderStyle color="#000000" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="13" fontStyle="bold" hasBackgroundColor="false" hasLineColor="false" height="19.92626953125" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="49.525390625" x="62.3466796875" xml:space="preserve" y="3.0">Vehicle<y:LabelModel><y:SmartNodeLabelModel distance="4.0"/></y:LabelModel><y:ModelParameter><y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/></y:ModelParameter></y:NodeLabel>
+          <y:UML clipContent="true" constraint="" hasDetailsColor="false" omitDetails="false" stereotype="" use3DEffect="true">
+            <y:AttributeLabel xml:space="preserve">position: float
+curVelocity: float
+maxVelocity: float
+brakeProp: float</y:AttributeLabel>
+            <y:MethodLabel xml:space="preserve">timeElapse(timestep: int): void</y:MethodLabel>
+          </y:UML>
+        </y:UMLClassNode>
+      </data>
+    </node>
+    <node id="n1">
+      <data key="d4" xml:space="preserve"/>
+      <data key="d5"/>
+      <data key="d6">
+        <y:UMLClassNode>
+          <y:Geometry height="171.0" width="227.0" x="377.0" y="80.5"/>
+          <y:Fill color="#FFCC00" transparent="false"/>
+          <y:BorderStyle color="#000000" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="13" fontStyle="bold" hasBackgroundColor="false" hasLineColor="false" height="19.92626953125" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="38.68994140625" x="94.155029296875" xml:space="preserve" y="3.0">Track<y:LabelModel><y:SmartNodeLabelModel distance="4.0"/></y:LabelModel><y:ModelParameter><y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/></y:ModelParameter></y:NodeLabel>
+          <y:UML clipContent="true" constraint="" hasDetailsColor="false" omitDetails="false" stereotype="" use3DEffect="true">
+            <y:AttributeLabel xml:space="preserve"/>
+            <y:MethodLabel xml:space="preserve">timeElapse(timestep: int): void</y:MethodLabel>
+          </y:UML>
+        </y:UMLClassNode>
+      </data>
+    </node>
+    <node id="n2">
+      <data key="d4" xml:space="preserve"/>
+      <data key="d5"/>
+      <data key="d6">
+        <y:UMLClassNode>
+          <y:Geometry height="116.00000000000003" width="174.21875" x="-26.453125" y="-56.39999999999999"/>
+          <y:Fill color="#FFCC00" transparent="false"/>
+          <y:BorderStyle color="#000000" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="13" fontStyle="bold" hasBackgroundColor="false" hasLineColor="false" height="19.92626953125" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="124.65625" x="24.78125" xml:space="preserve" y="3.0">VehicleTimeRecord<y:LabelModel><y:SmartNodeLabelModel distance="4.0"/></y:LabelModel><y:ModelParameter><y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/></y:ModelParameter></y:NodeLabel>
+          <y:UML clipContent="true" constraint="" hasDetailsColor="false" omitDetails="false" stereotype="" use3DEffect="true">
+            <y:AttributeLabel xml:space="preserve">position: float
+velocity: float
+timestep: int</y:AttributeLabel>
+            <y:MethodLabel xml:space="preserve"/>
+          </y:UML>
+        </y:UMLClassNode>
+      </data>
+    </node>
+    <edge id="e0" source="n1" target="n0">
+      <data key="d8" xml:space="preserve"/>
+      <data key="d9"/>
+      <data key="d10">
+        <y:PolyLineEdge>
+          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="none"/>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+    <edge id="e1" source="n0" target="n2">
+      <data key="d8" xml:space="preserve"/>
+      <data key="d9"/>
+      <data key="d10">
+        <y:PolyLineEdge>
+          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="none"/>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+  </graph>
+  <data key="d7">
+    <y:Resources/>
+  </data>
+</graphml>