"She is alone and in her pajamas," the complaint describes. "She is tugging at her hair and staring at her hands. After two trains pass, Olivia flops onto a platform bench. After a third train comes and goes, she gets up and begins walking along the platform's yellow textured caution strip toward the tunnel; with each step she moves closer and closer to the platform's edge. Near the mouth of the tunnel, she crouches down and then sits with her legs dangling off the platform. Within seconds, she jumps onto the train tracks and begins walking along the tracks into the dark tunnel."