Automated passive mob collection system for 1.8 VERSION 2

In this video I've added a pulse generator to regulate cart spacing like I promised but I came to the conclusion the system is all far too resource hungry and time consuming to be worthwhile actually using.
I give my final thoughts on this system and offer a far simpler but effective collection and transportation method.
This will also be perfect if you want get your very own Ermintrude from the new Mushroom biomes.
By the way, if you don't get the reference Ermintrude was a cow in an old BBC kids television show called Magic Roundabout that used to trip out on shrooms or poppies or something.