Things coming out over here:
Conditions were apparently dark, hot, smoky/sooty. Electricity powering the carriages went out (which prevented a lot of electrocutions from live rails). Mobile phone (cell) networks collapsed (although there are rumours the Government shut them down to prevent mobile-triggered bombs from detonating.)

One of the main things coming out is that those (few) people who had handkerchiefs/scarfs and 'key-ring' torches were in a lot better position than most people. There are reports of injuries from people smashing carriage windows / doors BY HAND.

I think the lesson is don't leave home without that 'don't leave home without it kit'.