Snowpiercer season 2: Melanie's failed return to the train opened up huge series plot hole

Although the ongoing instalment of TNT’s bleak dystopian drama keeps getting better, this latest development left some viewers scratching their heads.

The fatal flaw was first spotted by TVLine, as their rundown of last week’s biggest TV questions pointed out a key factor in the train’s design that the series somehow missed.

They wrote: “Didn’t the 10 miles-long Snowpiercer rumble past Melanie pretty quickly? Again, the train is 10. Miles. Long.”

While the Snowpiercer certainly travels fast, it isn’t quite so speedy that an abandoned passenger wouldn’t eventually be able to catch up to flag it down.