[Railcarmover]

The wear at the top of the tooth,what your calling 'sharp' is why I would shy away from running the cluster and slider gears in your picture. Once a tooth looses its width its on an unstoppable wear cycle..and will have a bunch of gear 'whine'. That being said alot depends on how much you drive the car,if it gets 10k miles in ten years those parts will last.