First and second crossing predictors communicate with each other, and each predictor transmits signals to instruct downstream adjacent predictors to activate their warning devices at a constant warning time by using train detection information from the other predictor. In one particular embodiment, the conjugated side-strapped phthalocyanine is of the formula:where each of the substituents are defined herein. The placental product of the present invention is useful in treating a patient with a tissue injury by applying the placental product to the injury. The intelligent wireless climate sensors perform periodic climate measurements and detect climate conditions in the smart rack.