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 57
Table title:
Fleet details
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Subclass </th><th colspan=1 rowspan=1 > No. Built </th><th colspan=1 rowspan=1 > No. Range </th><th colspan=1 rowspan=1 > Operators </th><th colspan=1 rowspan=1 > Loco Nos. </th><th colspan=1 rowspan=1 > Total </th></tr>
<tr> <td colspan=1 rowspan=2 > 57/0 </td><td colspan=1 rowspan=2 > 12 </td><td colspan=1 rowspan=2 > 57001-012 </td><td colspan=1 rowspan=1 > Direct Rail Services </td><td colspan=1 rowspan=1 > 57002, 57003, 57004, 57007, 57008, 57009, 57010, 57011, 57012 </td><td colspan=1 rowspan=1 > 9 </td></tr>
<tr> <td colspan=1 rowspan=1 > West Coast Railways </td><td colspan=1 rowspan=1 > 57001, 57005, 57006 </td><td colspan=1 rowspan=1 > 3 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=3 > 57/3 </td><td colspan=1 rowspan=3 > 16 </td><td colspan=1 rowspan=3 > 57301-316 </td><td colspan=1 rowspan=1 > Direct Rail Services </td><td colspan=1 rowspan=1 > 57301, 57302, 57303, 57304, 57306, 57307, 57308, 57309, 57310, 57311 </td><td colspan=1 rowspan=1 > 10 </td></tr>
<tr> <td colspan=1 rowspan=1 > Rail Operations Group </td><td colspan=1 rowspan=1 > 57305, 57312 </td><td colspan=1 rowspan=1 > 2 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > West Coast Railways </td><td class="highlighted"  colspan=1 rowspan=1 > 57313, 57314, 57315, 57316 </td><td colspan=1 rowspan=1 > 4 </td></tr>
<tr> <td colspan=1 rowspan=2 > 57/6 </td><td colspan=1 rowspan=2 > 5 </td><td colspan=1 rowspan=2 > 57601-605 </td><td colspan=1 rowspan=1 > Great Western Railway </td><td colspan=1 rowspan=1 > 57602, 57603, 57604, 57605 </td><td colspan=1 rowspan=1 > 4 </td></tr>
<tr> <td colspan=1 rowspan=1 > West Coast Railways </td><td colspan=1 rowspan=1 > 57601 </td><td colspan=1 rowspan=1 > 1 </td></tr>
</table>
Question:
Who operated the sub-classes of 57313-316, and how many sub-classes were there?
Answer:
All three 57 sub-classes of 57313-316 were operated by West Coast Railways.