alt Hacker NewsI would never take this one into a train. I'm pretty sure it is a better pack (and much better monitored) than a store bought one given what I've seen inside of those but still, the amount of energy stored in there is pretty impressive and just the thought of it going into thermal runaway is enough to ensure that will never expose other people to it.
That is very considerate of you, but my bike has a very small standard battery (in comparison). Still, it would be good if trains offered a way to store the bikes in a special place away from people (at the end of the train for instance) so this won't be an issue.