Four Way Multiplayer Minecart Intersection

This is a 4 way double track rail intersection built for multiplayer use that is feasible to build in survival and should work well in smp. This video is just a showcase, however I will be uploading a video tutorial on the design. Link to world download: http://www.mediafire.com/download/m7pzi43rldae2tx/4_way_multiplayer.zip