Minecart Powered Iron Door

This is a MCPE contaption built in D FloatingCOWW's lab, this is an iron door being opened by a minecart.This was built in D FloatingCOWW's video: Minecraft PE 13.0! I'm Back in Minecraft! . How to build it:

Items: Redstone Torch, Powered Rail, 4 Activator Rails,Detector Rail,3 Redstone, Iron Door, and Minecart.