Snowpiercer has been given a mid fourth season renewal by TNT.

The declaration was made in a video shared on TNT’s YouTube channel highlighting Daveed Diggs and the rest of the show’s cast as they arranged to wrap filming on season three.

In a statement to Variety, Sam Linsky and Adrienne O’Riain, co-heads of scripted original programming for TBS, TNT and truTV, said: “Snowpiercer has been an incredibly successful series for us that continues to capture the imagination of viewers, grow audience and maintain strong ratings.

“All of our seasons embark on an emotional, unexpected ride and the well-plotted storylines will continue to evolve and remain relevant to audiences. We’re excited to keep the train running into season four.”

The second season of Snowpiercer finished with Melanie (Jennifer Connelly) apparently meeting her end in the wake of walking into the Freeze to die.

However, the actress has effectively been affirmed as returning for season three and, as executive producer Becky Clements clarified, Melanie’s storyline was in part to do with Jennifer’s “very busy professional life”.

“[Showrunner] Graeme [Manson] knew very early on, so he and the writing team came up with this really great idea of the research station and then the ‘time collision’ that took us to the end of the season.

“Having the ticking clock of, ‘We need to make sure we have some place to be at a certain time!’ is always valuable, and with a very limiting Wilford always wondering what is happening,” Clements added.

Clements then, at that point recommended that Melanie may have indeed survived her walk into the Freeze.

“I don’t know if I’m going on record that she is ‘done for’, but I don’t know that she is alive,” she added.

Snowpiercer season two broadcasted on TNT in the US. Season one and two are accessible to stream on Netflix in the UK.