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:
North–South railway (Vietnam)
Table title:
Passenger service
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Train </th><th colspan=1 rowspan=1 > Type </th><th colspan=1 rowspan=1 > From </th><th colspan=1 rowspan=1 > To </th><th colspan=1 rowspan=1 > Length </th><th colspan=1 rowspan=1 > Notes </th></tr>
<tr> <td colspan=1 rowspan=1 > SE1/SE2 </td><td class="highlighted"  colspan=1 rowspan=1 > Express </td><td class="highlighted"  colspan=1 rowspan=1 > Hanoi </td><td class="highlighted"  colspan=1 rowspan=1 > Ho Chi Minh City </td><td colspan=1 rowspan=1 > 34 hrs, 40 mins </td><td colspan=1 rowspan=1 > Stops at Nam Định, Thanh Hóa, Vinh, Đồng Hới, Dong Ha, Huế, Lang Co, Da Nang, Tam Ky, Quảng Ngãi, Dieu Tri, Tuy Hòa, Nha Trang, Thap Cham, Muong Man </td></tr>
<tr> <td colspan=1 rowspan=1 > SE3/SE4 </td><td class="highlighted"  colspan=1 rowspan=1 > Express </td><td class="highlighted"  colspan=1 rowspan=1 > Hanoi </td><td class="highlighted"  colspan=1 rowspan=1 > Ho Chi Minh City </td><td colspan=1 rowspan=1 > 29 hrs, 30 mins </td><td colspan=1 rowspan=1 > Stops at Vinh, Đồng Hới, Huế, Da Nang, Dieu Tri, Nha Trang </td></tr>
<tr> <td colspan=1 rowspan=1 > SE5/SE6 </td><td class="highlighted"  colspan=1 rowspan=1 > Express </td><td class="highlighted"  colspan=1 rowspan=1 > Hanoi </td><td class="highlighted"  colspan=1 rowspan=1 > Ho Chi Minh City </td><td colspan=1 rowspan=1 > 32 hrs </td><td colspan=1 rowspan=1 > Stops at Phủ Lý, Nam Định, Ninh Bình, Thanh Hóa, Vinh, Đồng Hới, Huế, Da Nang, Quảng Ngãi, Dieu Tri, Nha Trang, Thap Cham, Muong Man, Bien Hoa </td></tr>
<tr> <td colspan=1 rowspan=1 > TN1/TN2 </td><td colspan=1 rowspan=1 > Local </td><td colspan=1 rowspan=1 > Hanoi </td><td colspan=1 rowspan=1 > Ho Chi Minh City </td><td colspan=1 rowspan=1 > 40 hrs, 50 mins </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > TN3/TN4 </td><td colspan=1 rowspan=1 > Local </td><td colspan=1 rowspan=1 > Hanoi </td><td colspan=1 rowspan=1 > Ho Chi Minh City </td><td colspan=1 rowspan=1 > 40 hrs, 45 mins </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > TN5/TN6 </td><td colspan=1 rowspan=1 > Local </td><td colspan=1 rowspan=1 > Hanoi </td><td colspan=1 rowspan=1 > Ho Chi Minh City </td><td colspan=1 rowspan=1 > 40 hrs, 10 mins </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > TN7/TN8 </td><td colspan=1 rowspan=1 > Local </td><td colspan=1 rowspan=1 > Hanoi </td><td colspan=1 rowspan=1 > Ho Chi Minh City </td><td colspan=1 rowspan=1 > 40 hrs, 25 mins </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > NA1/NA2 </td><td class="highlighted"  colspan=1 rowspan=1 > Local </td><td class="highlighted"  colspan=1 rowspan=1 > Hanoi </td><td class="highlighted"  colspan=1 rowspan=1 > Vinh </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > NA3/NA4 </td><td class="highlighted"  colspan=1 rowspan=1 > Local </td><td class="highlighted"  colspan=1 rowspan=1 > Hanoi </td><td class="highlighted"  colspan=1 rowspan=1 > Vinh </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > TH1/TH2 </td><td colspan=1 rowspan=1 > Local </td><td colspan=1 rowspan=1 > Giap Bat </td><td colspan=1 rowspan=1 > Thanh Hóa </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > VD31/VD32 </td><td class="highlighted"  colspan=1 rowspan=1 > Local </td><td class="highlighted"  colspan=1 rowspan=1 > Vinh </td><td class="highlighted"  colspan=1 rowspan=1 > Đồng Hới </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > OUT OF SERVICES </td></tr>
<tr> <td colspan=1 rowspan=1 > DH41/DH42 </td><td colspan=1 rowspan=1 > Local </td><td colspan=1 rowspan=1 > Đồng Hới </td><td colspan=1 rowspan=1 > Huế </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > OUT OF SERVICES </td></tr>
<tr> <td colspan=1 rowspan=1 > VQ1/VQ2 </td><td class="highlighted"  colspan=1 rowspan=1 > Local </td><td class="highlighted"  colspan=1 rowspan=1 > Vinh </td><td class="highlighted"  colspan=1 rowspan=1 > Quy Nhon </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
</table>
Question:
How fast is the express service of Vietnam's North-South railway?
Answer:
Express service links Hanoi and Ho Chi Minh City, making stops at stations; local service is also provided along portions of the line, such as from Hanoi to Vinh, Vinh to Đồng Hới and Vinh to Quy Nhon.