Back in the olden days when a lot of people thought the railways were on their way out the main line between Salisbury and Exeter was singled. This was an unmitigated disaster because the long stretches of single track without passing loops almost guaranteed delays.
Of course time's moved on, the line is now reasserting itself as a proper main line, and several stations (including our beloved Templecombe) have reopened. But it's nothing compared to what will happen in the future. Redoubling of the whole route is inevitable, as is reopening many of the closed stations, together with restored branches and of course the S&D which joins the line at Templecombe.
To help speed the process along please sign this petition which calls for the redoubling of the whole line.