Block Signal

The Block Signal is a block from the Railcraft mod. This block is used in Railcraft signaling as a controller block. A controller is a block that emits an aspect depending on certain rules being met. These aspects are red, green, yellow, and blinking red. Red means that there is a cart in the signal block, or a set of tracks in between two controller blocks, but the cart is not moving, or is moving slowly. A red aspect can also mean that there is a cart coming from the other end of the signal block. A green aspect means that there is no cart in the signal block. A yellow aspect means that there is a cart moving from that side of the signal block. A blinking red aspect means that there is no established signal block. A blinking red aspect means that

The Block Signal used to create signal blocks, which is a set of tracks in between two controller blocks. These have a certain distance that they can read tracks; two blocks horizontally, and four blocks vertically. They can be used with a receiver block, such as the Distant Signal. You can establish a signal block by using a Signal Block Surveyor on the two Block Signals.