Last week’s regionwide power outages fueled the confusion around a Metro train stoppage on the Green Line that prompted riders to walk on tracks to escape a hot, stalled train, according to Metro.

The transit agency briefed board members Thursday on the chaotic July 3 “self-evacuation” of riders, plus a heat kink-induced derailment from last week, a recent case of brake equipment falling off an Orange Line train and two cases of train operators running red signals — all events that happened in the last month.