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:
Chester Creek Branch
Table title:
History
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Locality </th><th colspan=1 rowspan=1 > Milepost </th><th colspan=1 rowspan=1 > Station </th><th colspan=1 rowspan=1 > Lat/long </th><th colspan=1 rowspan=1 > Notes/Connections </th></tr>
<tr> <td colspan=1 rowspan=3 > Lenni </td><td colspan=1 rowspan=1 > 0.0 </td><td colspan=1 rowspan=1 > Lenni </td><td colspan=1 rowspan=1 > 39°53′39″N 75°26′55″W / 39.8942°N 75.4486°W </td><td colspan=1 rowspan=1 > Currently used as a SEPTA training base; has a passing siding. Station demolished. </td></tr>
<tr> <th colspan=5 rowspan=1 > West Chester & Chester Creek Branches split </th></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Rockdale </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Chester Twp. </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Bridgewater </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Upland </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Upland </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=6 rowspan=1 > Lamokin Run Branch & Chester Creek Branches split </th></tr>
<tr> <td colspan=1 rowspan=1 > Chester (City) </td><td class="highlighted"  colspan=1 rowspan=1 > 7.25 </td><td colspan=1 rowspan=1 > Lamokin Street </td><td colspan=1 rowspan=1 > 39°50′31″N 75°22′32″W / 39.8420°N 75.3756°W </td><td colspan=1 rowspan=1 > Closed by SEPTA in 2003 </td></tr>
<tr> <th class="highlighted"  colspan=9 rowspan=1 > Line abandoned in 1972 </th></tr>
</table>
Question:
chester creek branch was a 7.25-mile railroad that operated from which year to what year?
Answer:
The Chester Creek Branch was a 7.25-mile railroad line that operated from 1869 to 1972.