Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
List of Berlin U-Bahn stations
Table title:
S
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Station </th><th colspan=1 rowspan=1 > Line </th><th colspan=1 rowspan=1 > Opened </th><th colspan=1 rowspan=1 > Situation </th></tr>
<tr> <td colspan=1 rowspan=1 > Samariterstraße </td><td colspan=1 rowspan=1 > U5 </td><td colspan=1 rowspan=1 > 21 December 1930 </td><td colspan=1 rowspan=1 > underground </td></tr>
<tr> <td colspan=1 rowspan=1 > Scharnweberstraße </td><td colspan=1 rowspan=1 > U6 </td><td colspan=1 rowspan=1 > 31 May 1958 </td><td colspan=1 rowspan=1 > embankment </td></tr>
<tr> <td colspan=1 rowspan=1 > Schillingstraße </td><td colspan=1 rowspan=1 > U5 </td><td colspan=1 rowspan=1 > 21 December 1930 </td><td colspan=1 rowspan=1 > underground </td></tr>
<tr> <td colspan=1 rowspan=1 > Schlesisches Tor </td><td colspan=1 rowspan=1 > U1 </td><td colspan=1 rowspan=1 > 18 February 1902 </td><td colspan=1 rowspan=1 > elevated </td></tr>
<tr> <td colspan=1 rowspan=1 > Schloßstraße </td><td colspan=1 rowspan=1 > U9 </td><td colspan=1 rowspan=1 > 30 September 1974 </td><td colspan=1 rowspan=1 > underground </td></tr>
<tr> <td colspan=1 rowspan=1 > Schönhauser Allee </td><td colspan=1 rowspan=1 > U2 </td><td colspan=1 rowspan=1 > 27 July 1913 </td><td colspan=1 rowspan=1 > elevated </td></tr>
<tr> <td colspan=1 rowspan=1 > Schönleinstraße </td><td colspan=1 rowspan=1 > U8 </td><td colspan=1 rowspan=1 > 17 July 1927 </td><td colspan=1 rowspan=1 > underground </td></tr>
<tr> <td colspan=1 rowspan=1 > Schwartzkopffstraße </td><td colspan=1 rowspan=1 > U6 </td><td colspan=1 rowspan=1 > 8 March 1923 </td><td colspan=1 rowspan=1 > underground </td></tr>
<tr> <td colspan=1 rowspan=1 > Seestraße </td><td colspan=1 rowspan=1 > U6 </td><td colspan=1 rowspan=1 > 8 March 1923 </td><td colspan=1 rowspan=1 > underground </td></tr>
<tr> <td colspan=1 rowspan=1 > Senefelderplatz </td><td colspan=1 rowspan=1 > U2 </td><td colspan=1 rowspan=1 > 27 July 1913 </td><td colspan=1 rowspan=1 > underground </td></tr>
<tr> <td colspan=1 rowspan=1 > Siemensdamm </td><td colspan=1 rowspan=1 > U7 </td><td colspan=1 rowspan=1 > 1 October 1980 </td><td colspan=1 rowspan=1 > underground </td></tr>
<tr> <td colspan=1 rowspan=1 > Sophie-Charlotte-Platz </td><td colspan=1 rowspan=1 > U2 </td><td colspan=1 rowspan=1 > 29 March 1908 </td><td colspan=1 rowspan=1 > underground </td></tr>
<tr> <td colspan=1 rowspan=2 > Spichernstraße </td><td colspan=1 rowspan=1 > U3 </td><td colspan=1 rowspan=1 > 2 June 1959 </td><td colspan=1 rowspan=2 > underground </td></tr>
<tr> <td colspan=1 rowspan=1 > U9 </td><td colspan=1 rowspan=1 > 28 August 1961 </td></tr>
<tr> <td colspan=1 rowspan=1 > Spittelmarkt </td><td colspan=1 rowspan=1 > U2 </td><td colspan=1 rowspan=1 > 1 October 1908 </td><td colspan=1 rowspan=1 > underground </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=2 > Stadtmitte </td><td class="highlighted"  colspan=1 rowspan=1 > U2 </td><td colspan=1 rowspan=1 > 1 October 1908 </td><td colspan=1 rowspan=2 > underground </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > U6 </td><td colspan=1 rowspan=1 > 30 January 1923 </td></tr>
<tr> <td colspan=1 rowspan=1 > Strausberger Platz </td><td colspan=1 rowspan=1 > U5 </td><td colspan=1 rowspan=1 > 21 December 1930 </td><td colspan=1 rowspan=1 > underground </td></tr>
<tr> <td colspan=1 rowspan=1 > Südstern </td><td colspan=1 rowspan=1 > U7 </td><td colspan=1 rowspan=1 > 14 December 1924 </td><td colspan=1 rowspan=1 > underground </td></tr>
</table>
Question:
What line is the Stadtmitte located?
Answer:
Stadtmitte is a Berlin U-Bahn station located on the U2 and the U6.