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:
NSR H class
Table title:
List of Locomotives
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > NSR number </th><th colspan=1 rowspan=1 > Built </th><th colspan=1 rowspan=1 > First LMS number </th><th colspan=1 rowspan=1 > Second LMS number </th><th colspan=1 rowspan=1 > Withdrawn </th><th colspan=1 rowspan=1 > Notes </th></tr>
<tr> <td colspan=1 rowspan=1 > 84 </td><td colspan=1 rowspan=1 > December 1909 </td><td class="highlighted"  colspan=1 rowspan=1 > 2359 </td><td class="highlighted"  colspan=1 rowspan=1 > 8681 </td><td colspan=1 rowspan=1 > January 1930 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 85 </td><td colspan=1 rowspan=1 > December 1909 </td><td class="highlighted"  colspan=1 rowspan=1 > 2360 </td><td class="highlighted"  colspan=1 rowspan=1 > 8682 </td><td colspan=1 rowspan=1 > May 1929 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 88 </td><td colspan=1 rowspan=1 > December 1909 </td><td class="highlighted"  colspan=1 rowspan=1 > 2361 </td><td class="highlighted"  colspan=1 rowspan=1 > 8683 </td><td colspan=1 rowspan=1 > May 1928 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 169 </td><td colspan=1 rowspan=1 > December 1909 </td><td class="highlighted"  colspan=1 rowspan=1 > 2362 </td><td class="highlighted"  colspan=1 rowspan=1 > 8684 </td><td colspan=1 rowspan=1 > November 1928 </td><td colspan=1 rowspan=1 >  </td></tr>
</table>
Question:
How many numbers do the NSR H class have?
Answer:
NSR H class were numbered twice in LMS, the first number was in the 23xx series and the second number in a series from 8681 to 8684.