A method for controlling the behavior of a telephone using policies, the method comprising a Policy Creation Program and a Behavior Control Program. Then, the signals from the antennas A and B are alternately input to a wireless receiving unit. The vector processor may also include one or more input-stream units for retrieving data from memory. The selection of symbol rate and number of carriers can be optimized for a given channel based on explicit channel measurements, a priori knowledge of the channel, or past experience. Also disclosed are braking systems including dynamic braking for a train having at least one locomotive.