When will New York City win its war against leaves? The B and the Q trains are still enjoying a late fall issue, according to the MTA: “Fallen leaves, when crushed by train wheels, leave a slippery residue on the rails which may affect the train’s ability to start and stop.” What is this mysterious “residue”? Why do we allow trees to attack our important infrastructure? Let’s finish this once and for all. Kill the trees, save the subways.