So, the story is that the laws of physics change, but nobody puts any effort into finding out why or "changing it back" because that's not the story - instead, the story is how people cope with being cast back to the 19th C or even earlier, before telegraphs. Would steam power still work?
Anyway, that might be interesting, but hard to pull off. It depends so heavily on the characters being compelling and the audience caring whether they live or die. Just look at Alcatraz
or Terra Nova
and imagine those characters in this story. I wouldn't give a flip about any of it.
It could be great, but the odds would be better if they had some gimmick to amp the action every so often. Zombie attacks are a great way to distract from characters who are starting to annoy you.