The sonorous voice announcement is attention getting. “Stand away from the moving platform”. This warning takes place in the silence of no train being in sight. When the subway train begins to enter the station, then the voice begins again. Watching to see why the platform needs to move: there is a curve in the track. If the platform did not retract, the side of the cars would scrape along the bend of the platform. By the absence of the platform cars can just slip by. When the train comes to a stop, there is a holding of the doors while the platform juts forward to fill the gap. Once in place the doors open and everyone exits and enters. The doors close and the platform once again retracts.