There would only be one loco going over the scissors crossover at a time, so it would either be set as straight, or cross. The built in point motors do that for you. The price examples I gave were the full prices from two of the major UK retailers. I mostly by mine from Plaza Japan like Nick, where they are much cheaper, when they are in stock. There's now a UK based Ebay shop ( fastrack99) that sells the Kato Scissors Crossing for £38.65.