Big Boy and Rusty, I realize in a true dead rail you do not even need rails. Tested plenty of battery operated G on the kitchen floor
BUT please read the original post the op was asking about. He was going to use his pickup roller to transfer battery power from his battery car to the train. That means it will go across rails. In which case for 3R engines, you need the center rail. I was trying to stay on topic. That was my context when replying. 
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