Thank you for your help Chris, I'm sure the many people hurt are very grateful you were there.
Chris can I ask: from your car first aid kit, for this mass casualty situation, what would you wish you had more of to treat the wounded?
I maintain mass casualty treatment bags besides my FAK in my home, car and office, hopefully never to be used but they're there - lots of 4x4s, Kerlix, Coban wrap, tape, tape, gloves, shears, markers, ABD pads, a number of triangle bandages; a couple OLAES bandages because I had them, a SOF-T tourniquet on the off chance, and an Asherman's chest seal because its smallish and an EMT may know how and when to apply tourn or chest seal (I am at best marginally trained for them and until I am would trust in the 'apply pressure' maxim for the duration). 25 cheap rain ponchos, a couple AMK bivvy sacks to provide warmth to the immobile. Also a 24" pry bar to help with minor extractions (jammed doors). It mostly fills an Eddie Bauer carry on bag but is organized enough to find what I need. I could open this up most likely after an earthquake for a building collapse (falling ceilings, crush injuries) when we would be on our own for a while before responders could arrive, although a train derailment is only a mile away. No meds, no poviodine, very little that expires, I can replenish in bulk from supplies as needed. It represents alot of blood stopping and immobilization (most of my current training), the FAK is for treating everyday issues.