Field trip to the tram stop

I was waiting for a streetcar in Inner Sunset when I saw this group of schoolchildren march to the corner across in orderly fashion. At first I thought they were crossing the street, then that they were waiting to board the train. Instead, when the Muni train approached, they all waved to the car. After it left, the teachers lined them up and they filed back down the street. Field trip to the tram stop!