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:
NBR 224 and 420 Classes
Table title:
Summary
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Original number </th><th colspan=1 rowspan=1 > Class </th><th colspan=1 rowspan=1 > Built </th><th colspan=1 rowspan=1 > Rebuilt </th><th colspan=1 rowspan=1 > Renumbered (year) </th><th colspan=1 rowspan=1 > Withdrawn </th></tr>
<tr> <td colspan=1 rowspan=1 > 224 </td><td colspan=1 rowspan=1 > 224 </td><td colspan=1 rowspan=1 > 1871 </td><td colspan=1 rowspan=1 > 1885, 1887, 1897 </td><td colspan=1 rowspan=1 > 1192 (1913) </td><td colspan=1 rowspan=1 > 1919 </td></tr>
<tr> <td colspan=1 rowspan=1 > 264 </td><td colspan=1 rowspan=1 > 224 </td><td colspan=1 rowspan=1 > 1871 </td><td colspan=1 rowspan=1 > 1893 </td><td colspan=1 rowspan=1 > 1198 (1913) </td><td colspan=1 rowspan=1 > 1917 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 420 </td><td colspan=1 rowspan=1 > 420 </td><td colspan=1 rowspan=1 > 1873 </td><td class="highlighted"  colspan=1 rowspan=1 > 1887 </td><td colspan=1 rowspan=1 > 1241 (1914) </td><td colspan=1 rowspan=1 > 1915 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 421 </td><td colspan=1 rowspan=1 > 420 </td><td colspan=1 rowspan=1 > 1873 </td><td class="highlighted"  colspan=1 rowspan=1 > 1887 </td><td colspan=1 rowspan=1 > 1242 (1914) </td><td colspan=1 rowspan=1 > 1918 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 422 </td><td colspan=1 rowspan=1 > 420 </td><td colspan=1 rowspan=1 > 1873 </td><td class="highlighted"  colspan=1 rowspan=1 > 1890 </td><td colspan=1 rowspan=1 > 1243 (1914) </td><td colspan=1 rowspan=1 > 1918 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 423 </td><td colspan=1 rowspan=1 > 420 </td><td colspan=1 rowspan=1 > 1873 </td><td class="highlighted"  colspan=1 rowspan=1 > 1890 </td><td colspan=1 rowspan=1 > 1244 (1914) </td><td colspan=1 rowspan=1 > 1914 </td></tr>
</table>
Question:
What years were the 420/421 and 422/423 locomotives rebuilt?
Answer:
In the NBR 224 and 420 Classes, the nos. 420/421 were rebuilt in 1887 and nos. 422/423 in 1890.