The model trains come to a prototypical smooth halt in front of signals showing red. This can add reality to your model railroad. For this purpose the braking generator supplies a special signal to some braking sections so that the trains move out smoothly. Yet all of the activated functions such as light, sound etc. remain switched on. It really looks genuine then!
In this case one brake generator is sufficient for many braking sections; please pay attention that their power requirements remain under 2.5 A. If your braking sections require more power (e.g.because of many illuminated cars), then simply use more braking generators. Each braking generator requires its own 16v transformer.