Translations:TrainCarts/API/SignAction/25/en

When the sign becomes powered from an unpowered state, REDSTONE_ON and REDSTONE_CHANGE fire. In reverse, REDSTONE_OFF and REDSTONE_CHANGE fire. When the power state doesn't change, but other blocks nearby change redstone levels that might influence the sign behavior, just REDSTONE_CHANGE is fired. The event has helper methods to figure out the power state of the sign or a given direction of the sign.