A multilevel railway auto rack car for transporting automobiles is provided having at least one upper deck with end segments pivotable to accommodate the difference in height of corresponding upper decks of adjacent auto rack cars and facilitate loading of automobiles between cars. Each rotary shaft extends through a rear housing member of the Roots pump. This information may be utilized in an overall advanced forward link trilateration process for estimating the location of the subscriber station. In one example, a voting model may use a probability distribution of a plurality of signal maps in order to identify a location with a highest probability of overlap with current signals received at a client device.