Snowpiercer
I'm watching the second season of Snowpiercer on Netflix, and enjoying it as much as the first.
The show is based on Bong Joon-ho's 2013 movie, starring Chris Evans and Tilda Swington, which in turn was based on the French graphic novel Le Transperceneige.
There are differences. The series has a great twist on the mysterious ruler of the train, Mr Wilford, and the story continues after a successful revolution of the downtrodden in Season 1, showing the revolutionary leaders' struggles with power.
If Season 1 was a (perhaps somewhat over-the-top) allegory of the capitalist class society, Season 2 is a microcosm of a post-revolutionary regime trying to hold together a fragile balance in the face of an external threat.
Recent episodes have fortunately had a little less of the excessive violence of Season 1 and the 2013 movie.