The phrase “mealy-mouthed politician” often seems redundant, so closely do we associate political figures with an aversion to direct answers that cut through the usual fog.

That does not describe Seth Moulton, the second-term Democratic congressman from Salem. Moulton answers questions with a degree of candor that is refreshing and sometimes jarring.

When CommonWealth sat down with him for this Conversation interview in November 2014, just after his election, Moulton said he was now wearing the politician badge reluctantly. When Bruce Mohl and I talked to him for this week’s Codcast, he still seemed to be in full candor mode.

Moulton has become a huge booster of the North-South Rail Link, and we dug into the details of why. (The project still looks like a longshot -- but Moulton is a pretty good salesman.) He had nothing positive to say, however, about the MBTA and its ability to constructively lead the way on the effort. “The T is very wedded to this old-fashioned 1950s-era diesel-powered commuter rail system,” he said. “I’m just afraid they’re really out of touch with what’s going on in the rest of the world.”