Helen Ford spoke to Simon Walton, who chairs the Campaign for Borders Rail, and put it to him that just last week an economic think tank described the project as "exceedingly poor value for money."
Campaigners are meeting tonight to renew calls for the new Borders Railway to be extended to Hawick.
The project, which is due to open by the summer of 2013, will only restore the Waverley Line between Edinburgh and Tweedbank near Galashiels.
The Campaign for Borders Rail thinks that will limit its potential to boost the economy.
Watch the full report from Kathryn Samson below.
Campaigners looking to have the Borders Railway extended will hold the annual general meeting today.
They want it extended through Melrose and Hawick, rather than it terminating at Tweedbank as previously planned.
Such an extension is not currently in the Scottish Government's plans.