Yes, I was referring to the door controls in the wide space between the center pair of doors. There were buttons on the panel for the car end doors.
I recall once, riding home from high school (Stuyvesant HS, which at that time was at 15th St. and First Ave.) to Brooklyn on the Brighton line when, due to a severe rainstorm and associated flooding in the open cut section, the line was closed, and the train stopped in the tunnel short of Prospect Park station. The conductor opened one door at the front of the first car, and ALL of the end doors, and the passengers walked through the train and a short distance on the catwalk into Prospect Park station (from where, using an "Emergency Transfer", I continued my trip home via bus).