The diamond crossing has no point blades but arguably requires the most complicated switching. There are two frogs, each of which is of the opposite polarity to the other, therefore a diamond crossing requires two switches, but the principle is the same. You can use Peco solenoids, fitted with PL-15 twin microswitches. Motors such as the Cobalt Analog ip and Tortoise also have two switches that can be utilised in situations such as these. Diamond crossings are frequently used as part of a double junction. In this case, the frogs on the diamond crossing can be doubled up with the switches on one of the point motors. You will have to watch out that the points are correctly set and that the conflicting route of the two main lines crossing each other isn’t selected.