跟踪节点行中的第一个节点

I've set up my game to have the same node repeatedly added from the bottom with different texture to move up to the top of the screen. I need a method to keep track of the node always leading this line of nodes. So if the original first node gets removed, the one behind it takes its place as the first node and I'm able to keep track of it. This is the code I've used to create my line of nodes. Any help would be appreciated. I've set up my game to have the same node repea