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    Jean,<br>
    <br>
       I see that Jeff has given some good debugging techniques.  A
    method I've used is to make an Identify Template showing the
    "COUCHE"  attribute value and any unique id value then doing an
    Identify on the feature (the value shown may give some insight into
    why it is being rendered as a railway).   Another method is to use
    an output format of GML and output the area using shp2img then
    examine the output values.<br>
    <pre class="moz-signature" cols="72">Best Regards,
Brent Fraser</pre>
    <div class="moz-cite-prefix">On 2/17/2016 3:40 AM, Jean Somers
      wrote:<br>
    </div>
    <blockquote
cite="mid:CAPXWrzpEPH0m-igH34v2S35y1Nc+M8k9hv_rH4OuGAeXNarqBQ@mail.gmail.com"
      type="cite">
      <div dir="ltr">The classification of the polyline base map data
        depends on the LAYER field, and for the concerned department (
        french county data, this field has no FER attribute (FER  french
        equivalent for RAIL).
        <div><br>
        </div>
        <div>I'm just mailing you the corresponding  Layer of the
          Mapfile:</div>
        <div><br>
        </div>
        <div>
          <div>LAYER</div>
          <div><span style="white-space:pre-wrap">        </span>TILEINDEX
            "./******/generic/index/_polyline_idx"</div>
          <div><span style="white-space:pre-wrap">        </span>TILEITEM
            "LOCATION"</div>
          <div><span style="white-space:pre-wrap">        </span>METADATA</div>
          <div><span style="white-space:pre-wrap">                </span>INCLUDE
            './*******/basemap_cache.cfg'</div>
          <div><span style="white-space:pre-wrap">                </span>"GI_DO_NOT_CONSULT"<span style="white-space:pre-wrap">   </span>"1"</div>
          <div><span style="white-space:pre-wrap">        </span>END</div>
          <div><span style="white-space:pre-wrap">        </span>PROJECTION</div>
          <div><span style="white-space:pre-wrap">        </span>
             "init=epsg:2154"</div>
          <div><span style="white-space:pre-wrap">        </span>END</div>
          <div><span style="white-space:pre-wrap">        </span>PROCESSING
            'CLOSE_CONNECTION=DEFER'</div>
          <div><span style="white-space:pre-wrap">        </span>NAME
            "@@FDP/generic/Lineaires"</div>
          <div><span style="white-space:pre-wrap">        </span>SIZEUNITS
            PIXELS</div>
          <div><span style="white-space:pre-wrap">        </span>STATUS ON</div>
          <div><span style="white-space:pre-wrap">        </span>TOLERANCEUNITS
            PIXELS</div>
          <div><span style="white-space:pre-wrap">        </span>TYPE LINE</div>
          <div><span style="white-space:pre-wrap">        </span>UNITS METERS</div>
          <div><span style="white-space:pre-wrap">        </span>CLASSITEM
            "COUCHE"</div>
        </div>
      </div>
    </blockquote>
    <br>
    <blockquote
cite="mid:CAPXWrzpEPH0m-igH34v2S35y1Nc+M8k9hv_rH4OuGAeXNarqBQ@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div><span style="white-space:pre-wrap"></span><span style="white-space:pre-wrap">  </span>CLASS
          <div><span style="white-space:pre-wrap">        </span>MAXSCALEDENOM
            49000</div>
          <div><span style="white-space:pre-wrap">                </span>NAME "Voies
            ferrées"</div>
          <div><span style="white-space:pre-wrap">                </span>EXPRESSION
            "FER"</div>
          <div><span style="white-space:pre-wrap">                </span>STYLE</div>
          <div><span style="white-space:pre-wrap">                        </span>ANTIALIAS
            TRUE</div>
          <div><span style="white-space:pre-wrap">                        </span>COLOR 102
            102 102</div>
          <div><span style="white-space:pre-wrap">                        </span>WIDTH 4</div>
          <div><span style="white-space:pre-wrap">                        </span>SYMBOL 0</div>
          <div><span style="white-space:pre-wrap">                </span>END</div>
          <div><span style="white-space:pre-wrap">                </span>STYLE</div>
          <div><span style="white-space:pre-wrap">                        </span>ANTIALIAS
            TRUE</div>
          <div><span style="white-space:pre-wrap">                        </span>COLOR 240
            240 240</div>
          <div><span style="white-space:pre-wrap">                        </span>SIZE 2</div>
          <div><span style="white-space:pre-wrap">                        </span>SYMBOL
            'rectangle-railway'</div>
          <div><span style="white-space:pre-wrap">                        </span>WIDTH 1</div>
          <div><span style="white-space:pre-wrap">                </span>END</div>
          <div><span style="white-space:pre-wrap">        </span>END</div>
        </div>
        <br>
      </div>
    </blockquote>
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