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:
Diesel Traction Group (NZ)
Table title:
Locomotives
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Original Class and Number </th><th colspan=1 rowspan=1 > TMS Number </th><th colspan=1 rowspan=1 > Builder </th><th colspan=1 rowspan=1 > Builders Number </th><th colspan=1 rowspan=1 > Year Built </th><th colspan=1 rowspan=1 > Arrived </th><th colspan=1 rowspan=1 > Notes </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > DE 511 </td><td class="highlighted"  colspan=1 rowspan=1 > DE 1412 </td><td colspan=1 rowspan=1 > English Electric </td><td colspan=1 rowspan=1 > 1749 </td><td colspan=1 rowspan=1 > 1951 </td><td class="highlighted"  colspan=1 rowspan=1 > 1987 </td><td colspan=1 rowspan=1 > Currently undergoing repairs. </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > DE 512 </td><td class="highlighted"  colspan=1 rowspan=1 > DE 1429 </td><td colspan=1 rowspan=1 > English Electric </td><td colspan=1 rowspan=1 > 1750 </td><td colspan=1 rowspan=1 > 1951 </td><td class="highlighted"  colspan=1 rowspan=1 > 1987 </td><td colspan=1 rowspan=1 > Currently operational. On loan to the Weka Pass Railway. </td></tr>
<tr> <td colspan=1 rowspan=1 > DF 1501 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > English Electric </td><td colspan=1 rowspan=1 > 1927 </td><td colspan=1 rowspan=1 > 1954 </td><td colspan=1 rowspan=1 > 2009 </td><td colspan=1 rowspan=1 > Owned by FRONZ. DF 1501 arrived by rail in 2009, and will eventually be restored. </td></tr>
<tr> <td colspan=1 rowspan=1 > DG 772 </td><td colspan=1 rowspan=1 > DG 2255 </td><td colspan=1 rowspan=1 > English Electric </td><td colspan=1 rowspan=1 > 2276/D355 </td><td colspan=1 rowspan=1 > 1955 </td><td colspan=1 rowspan=1 > 1983 </td><td colspan=1 rowspan=1 > The first locomotive owned by the DTG, restored in 2009 to operating condition with mainline accreditation. Originally entered service as DH 772. </td></tr>
<tr> <td colspan=1 rowspan=1 > DI 1102 </td><td colspan=1 rowspan=1 > DI 1820 </td><td colspan=1 rowspan=1 > English Electric </td><td colspan=1 rowspan=1 > A121 </td><td colspan=1 rowspan=1 > 1966 </td><td colspan=1 rowspan=1 > 1992 </td><td colspan=1 rowspan=1 > Only surviving ex-NZR diesel locomotive in preservation to have been built at English Electric's Rocklea, Qld. plant. Mainline certified. </td></tr>
</table>
Question:
What class of locomotives did the Diesel Traction Group have in 1987?
Answer:
In 1987, the Diesel Traction Group (NZ) had two Dᴱ class locomotives, Dᴱ's 511 and 512 (TMS DE 1412 and DE 1429).