Mike,I couldn't find a photo,so I made a crude drawing of how it looks.
the pkg car(brown right) backs up to the belt (black)which serves as a platform for preloaders to work from.AS the boxline moves in a huge oval,which is on a decline to allow everyone the sort them into the appropriate car from waist high.Each cage is a specific color that would contain the pkgs for 3 or 4 cars.Example if my route was 4155A,B or C,one cage is devoted to only these cars,say bottom green.
At our hub we have 6 of these boxlines and each one feeds about 50 pkg cars with about 25 on each side.The belt is used for the most part at the end of the day to unload the cars onto.
did that make sense?