 Lighting is provided by ceiling lamps with incandescent bulbs (nowadays usually replaced by fluorescent lighting or LEDs); the passenger salons of intermediate trailers and power cars normally have 20 ceiling lamps, those of driving trailers 16, and vestibules 2 each.These lamps are powered by the motor-generators (see below), so if this fails, all lights in the 2-car section go out; to prevent the section from being completely darkened, some of the ceiling lamps include an emergency light which consists of a low-powered incandescent bulb next to the main light, and draws its power from the storage battery.Ventilation is accomplished partly by opening the windows, and partly by a forced-air system served by 2 twin centrifugal fans.