Yonge&Bloor station, Yonge line, northbound platform, near the DWA. There's this light on the wall. It's one of those square lights that you often see on the outside walls of schools with an orange halogen bulb. This light was indoors, on a subway platform. It was glowing red. I was looking at it, wondering why there's a red light on the subway platform. Then it turns white and starts blinking. I'm increasingly curious, but the train I'm in starts moving and that's all I see of this light. I wonder what it's for?