Any thought of any kind of "accident" in the subway, would urge me to reinforce the bright side of my EDC : more light power (SF 6P), more LED lights (i.e. Inova T1, Nuwaï QIII, head lamp and the like...) and more batteries...

If you are not in the targeted car, you may have to walk or help people walk inside very dark tunnels ....
And as much as I like Photon micro-lights, I would prefer some other larger models on hands.