On Saturday, I walked from one end of the new TTC subway train to the other.
As I passed by, I grabbed a red handle bar at the top and pulled it down to a vertical position. When I let it go, it moved back to its default horizontal position.
Going south on the Yonge-University-Spadina line means that orange LEDs turn green. The next stop is a flashing LED. If the LED connects to another subway line, it might not turn green after you pass it.
Subway cars are connected together with shiny plates of metal that you can step on.