Signals

Introduction
Railway Signals are useful devices that allow you to control train movement. They do this by preventing trains from entering areas where other trains might be, and so preventing them from crashing. This usually involves taking information from the section of track following the signal. The three main types of signal are block signals, which simply deny access if the section has any trains; pre-signals, which operate similarly, but also require there to be an available exit from the section; and path signals, which compares the train's desired path to current train presence and allows access if the two do not interfere.Signals are one of the best ways to maintain a good train line. They command trains to stop or go, and when and where to enter or exit. There are two types, Semaphore, and Electric. They can be converted between both types, if desired. Signals are necessary for complex stations and rail lines, and for holding high amounts of traffic. All signals must require a track in order to be placed.

Signal Blocks
This term will be used more often when talking about signals. A signal block consists of a shape, made by the position of block signals. Typically, a train will wait outside of a signal block if there is anything on it, such as other trains, remains of a collision, or road vehicles crossing the track.