Dev:Clearance gauge

<track id='tr_80.6207.1_1'
       name='BHW-BXH'
       type='mainTrack'>
  <trackTopology>
    <trackBegin id='trn_BHW_80.6207.1_1'
                pos='0'
                absPos='72760'>
      <macroscopicNode ocpRef='ocp_BHW'/>
    </trackBegin>
    <trackEnd id='trn_BXH_80.6207.1_1'
              pos='60856'
              absPos='13424'>
      <macroscopicNode ocpRef='ocp_BXH'/>
    </trackEnd>
  </trackTopology>
  <trackElements>
    <clearanceGaugeChanges>
      <clearanceGaugeChange id="cs263011"
                            pos="182">
        <clearanceGauge code="GA"/>
      </clearanceGaugeChange>
    </clearanceGaugeChanges>
  </trackElements>
</track>