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:
Trolleybuses in Sydney
Table title:
Fleet
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Image </th><th colspan=1 rowspan=1 > Fleet numbers </th><th colspan=1 rowspan=1 > Quantity </th><th colspan=1 rowspan=1 > Chassis </th><th colspan=1 rowspan=1 > Body </th><th colspan=1 rowspan=1 > Configuration </th><th colspan=1 rowspan=1 > In service </th></tr>
<tr> <td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > AEC 663T </td><td colspan=1 rowspan=1 > Park Royal </td><td colspan=1 rowspan=1 > Three axle, single deck </td><td colspan=1 rowspan=1 > 1934-1956 </td></tr>
<tr> <td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 2–3 </td><td colspan=1 rowspan=1 > 2 </td><td colspan=1 rowspan=1 > AEC 663T </td><td colspan=1 rowspan=1 > H McKenzie </td><td colspan=1 rowspan=1 > Three axle, single deck </td><td colspan=1 rowspan=1 > 1934-1956 </td></tr>
<tr> <td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 3 </td><td class="highlighted"  colspan=1 rowspan=1 > 1 </td><td class="highlighted"  colspan=1 rowspan=1 > AEC 761T </td><td class="highlighted"  colspan=1 rowspan=1 > Park Royal </td><td class="highlighted"  colspan=1 rowspan=1 > Two axle, double deck </td><td colspan=1 rowspan=1 > 1934-1948 </td></tr>
<tr> <td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 4-5 </td><td class="highlighted"  colspan=1 rowspan=1 > 2 </td><td class="highlighted"  colspan=1 rowspan=1 > AEC 761T </td><td class="highlighted"  colspan=1 rowspan=1 > Syd Wood </td><td class="highlighted"  colspan=1 rowspan=1 > Two axle, double deck </td><td colspan=1 rowspan=1 > 1936/37-1956 </td></tr>
<tr> <td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 6-16 </td><td colspan=1 rowspan=1 > 11 </td><td colspan=1 rowspan=1 > Leyland TTB4 </td><td colspan=1 rowspan=1 > Ritchie Brothers </td><td colspan=1 rowspan=1 > Three axle, double deck </td><td colspan=1 rowspan=1 > 1937-1959 </td></tr>
<tr> <td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 17-26 </td><td colspan=1 rowspan=1 > 10 </td><td colspan=1 rowspan=1 > AEC 664T </td><td colspan=1 rowspan=1 > Ritchie Brothers </td><td colspan=1 rowspan=1 > Three axle, double deck </td><td colspan=1 rowspan=1 > 1937-1959 </td></tr>
</table>
Question:
How many and what kind of AEC 761T trolleybuses were there in Sydney?
Answer:
Trolleybuses were joined by three AEC 761T double deck vehicles, one bodied by Park Royal and two by Syd Wood.