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:
British Rail Class 159
Table title:
Fleet details
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Class </th><th colspan=1 rowspan=1 > Operator </th><th colspan=1 rowspan=1 > No. Built </th><th colspan=1 rowspan=1 > Year Built </th><th colspan=1 rowspan=1 > Cars per Set </th><th colspan=1 rowspan=1 > Unit nos. </th><th colspan=1 rowspan=1 > Notes </th></tr>
<tr> <td colspan=1 rowspan=1 > Class 159/0 </td><td class="highlighted"  colspan=1 rowspan=2 > South Western Railway </td><td colspan=1 rowspan=1 > 22 </td><td colspan=1 rowspan=1 > 1992–1993 </td><td colspan=1 rowspan=2 > 3 </td><td colspan=1 rowspan=1 > 159001–159022 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Class 159/1 </td><td colspan=1 rowspan=1 > 8 </td><td colspan=1 rowspan=1 > 2006–07 (converted) </td><td colspan=1 rowspan=1 > 159101–159108 </td><td colspan=1 rowspan=1 > Converted from Class 158/0 </td></tr>
</table>
Question:
How is Class 159/1 operated?
Answer:
159/1 Class is operated by South West Trains.