rbt
Senior Member
You can place a light barrier on the side between the door and the train (like what is used in elevators and on the TTC’s Streetcars) to detect that the area is clear before starting the train. It’s not a big safety issue with the right protections.
Sure. The manufacturer of the hardware in the video doesn't appear to include light barriers though, and with a 10 inch gap it's a lot of sensors to cover that space. I also can't tell if the electronics support that type of detection or not.
The easy fix is to install it closer to the track edge, so there isn't a person sized gap between the train and the screen door BUT then something poking through the screen might catch on the train.
Toronto Fire would may also have issues with anything that fails to a closed position too (in power failure or overheated electronics) vs failing to an open position as it makes exiting a track-level fire more difficult. A mag-lock holding the contraption to the ceiling would probably resolve that problem though.