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:
SR Z class
Table title:
Locomotive Summary
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > SR No. </th><th colspan=1 rowspan=1 > BR No. </th><th colspan=1 rowspan=1 > Date Built </th><th colspan=1 rowspan=1 > Date Withdrawn </th></tr>
<tr> <td colspan=1 rowspan=1 > 950 </td><td class="highlighted"  colspan=1 rowspan=1 > 30950 </td><td colspan=1 rowspan=1 > March 1929 </td><td colspan=1 rowspan=1 > October 1962 </td></tr>
<tr> <td colspan=1 rowspan=1 > 951 </td><td class="highlighted"  colspan=1 rowspan=1 > 30951 </td><td colspan=1 rowspan=1 > April 1929 </td><td colspan=1 rowspan=1 > November 1962 </td></tr>
<tr> <td colspan=1 rowspan=1 > 952 </td><td class="highlighted"  colspan=1 rowspan=1 > 30952 </td><td colspan=1 rowspan=1 > May 1929 </td><td colspan=1 rowspan=1 > November 1962 </td></tr>
<tr> <td colspan=1 rowspan=1 > 953 </td><td class="highlighted"  colspan=1 rowspan=1 > 30953 </td><td colspan=1 rowspan=1 > May 1929 </td><td colspan=1 rowspan=1 > December 1962 </td></tr>
<tr> <td colspan=1 rowspan=1 > 954 </td><td class="highlighted"  colspan=1 rowspan=1 > 30954 </td><td colspan=1 rowspan=1 > June 1929 </td><td colspan=1 rowspan=1 > December 1962 </td></tr>
<tr> <td colspan=1 rowspan=1 > 955 </td><td class="highlighted"  colspan=1 rowspan=1 > 30955 </td><td colspan=1 rowspan=1 > July 1929 </td><td colspan=1 rowspan=1 > December 1962 </td></tr>
<tr> <td colspan=1 rowspan=1 > 956 </td><td class="highlighted"  colspan=1 rowspan=1 > 30956 </td><td colspan=1 rowspan=1 > August 1929 </td><td colspan=1 rowspan=1 > December 1962 </td></tr>
<tr> <td colspan=1 rowspan=1 > 957 </td><td class="highlighted"  colspan=1 rowspan=1 > 30957 </td><td colspan=1 rowspan=1 > September 1929 </td><td colspan=1 rowspan=1 > November 1962 </td></tr>
</table>
Question:
What numbers did the Z class have?
Answer:
The Z class were given the numbers 30950–30957 under the BR numbering system.