I suppose it's not the worst way to go but damn that's insane.

Yeah, dying in a tunnel filled with smoke from a stalled train is definitely a step up from getting hit by a meteorite.

You hear “500 die in Train Disaster” and you expect something more gruesome.

It's such a large number, it would require a 100% train derailment / a whole bridge collapsing if it wasn't asphyxiation.

I'd rather be hit by a meteorite than suffocate.

Even today, there's still people dying from CO poisoning because of ill-aired rooms, so don't forget to properly maintain your heating and aerate it.

And buy a carbon monoxide detector!

That's actually a fascinating/terrifying quirk of human physiology - unless there's CO2 present then so long as you're breathing you have no idea you're suffocating. You just start to feel a bit sleepy and uncoordinated, then doze off and never wake up.