Signal Block Surveyor

The Signal Block Surveyor is a tool from the Railcraft mod. This tool is used to establish signal blocks between two controller blocks, such as the Block Signal. When you use a Signal Block Surveyor on a controller, if you have the signal block set up properly it should say "Beginning Signal Block Survey" in chat. A proper signal block will have two controller blocks, tracks the go from one to the other, and the tracks are within the controllers ranges. When you finish a signal block survey by using the tool on another controller it should say "Successfully denied Signal Block" in chat. If the signal block is not valid, when you attempt to finish the survey it will say "Signal Block is not valid" in chat.