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:
ALCO HH series
Table title:
Specifications
Table:
<table id='hittask' contenteditable='False'>
<tr> <td colspan=1 rowspan=1 > Overall length </td><td colspan=1 rowspan=1 > 45 ft 2.75 in </td><td colspan=1 rowspan=1 > 13.79 m </td></tr>
<tr> <td colspan=1 rowspan=1 > Between bolster centers: </td><td colspan=1 rowspan=1 > 21 ft 3 in </td><td colspan=1 rowspan=1 > 6.48 m </td></tr>
<tr> <td colspan=1 rowspan=1 > Truck wheelbase: </td><td colspan=1 rowspan=1 > 8 ft 0 in </td><td colspan=1 rowspan=1 > 2.44 m </td></tr>
<tr> <td colspan=1 rowspan=1 > Width over grabirons: </td><td colspan=1 rowspan=1 > 9 ft 10 in </td><td colspan=1 rowspan=1 > 3.00 m </td></tr>
<tr> <td colspan=1 rowspan=1 > Height above rails: </td><td colspan=1 rowspan=1 > 14 ft 3 in </td><td colspan=1 rowspan=1 > 4.34 m </td></tr>
<tr> <td colspan=1 rowspan=1 > Wheel diameter: </td><td colspan=1 rowspan=1 > 40 in </td><td colspan=1 rowspan=1 > 1.02 m </td></tr>
<tr> <td colspan=1 rowspan=1 > Fuel capacity: </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Engine (HH600): </td><td colspan=2 rowspan=1 > McIntosh & Seymour 531 </td></tr>
<tr> <td colspan=1 rowspan=1 > Power (HH600): </td><td colspan=1 rowspan=1 > 600 hp </td><td colspan=1 rowspan=1 > 450 kW </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Engine (HH900): </td><td class="highlighted"  colspan=2 rowspan=1 > McIntosh & Seymour 531T (turbocharged) </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Power (HH900): </td><td class="highlighted"  colspan=1 rowspan=1 > 900 hp </td><td colspan=1 rowspan=1 > 670 kW </td></tr>
<tr> <td colspan=1 rowspan=1 > Engine (HH660): </td><td colspan=2 rowspan=1 > McIntosh & Seymour 538 </td></tr>
<tr> <td colspan=1 rowspan=1 > Power (HH660): </td><td colspan=1 rowspan=1 > 660 hp </td><td colspan=1 rowspan=1 > 500 kW </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Engine (HH1000): </td><td class="highlighted"  colspan=2 rowspan=1 > McIntosh & Seymour 538T (turbocharged) </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Power (HH1000): </td><td class="highlighted"  colspan=1 rowspan=1 > 1000 hp </td><td class="highlighted"  colspan=1 rowspan=1 > 750 kW </td></tr>
<tr> <td colspan=1 rowspan=1 > Main generator: </td><td colspan=2 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Traction motors: </td><td colspan=2 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Standard gearing: </td><td colspan=2 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Weight: </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
</table>
Question:
Which type of engine improved upon the HH900 engine and what is the total horsepower?
Answer:
The HH1000 replaced the HH900, replacing the 531 engine with the new McIntosh and Seymour 538T engine, turbocharged to produce 1000 hp (750 kW), a 100 hp increase on the previous model.