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I think have find the whole secret regarding signalling. In Train Fever the a.i. of the program takes care of placing all the exit signals. Exit signals are invisible placed every where where they are needed. The exit signals are build at the end of the station platforms, where a train leave a depot and on the switches too! The exit signals om the switch works in all the 3 switch directions. The automatic placed invisible exit signals are never one way signals. A one way signal allows only the passage of trains driving in the direction of the front side of the signal, the passage from the back side of a one way signal is not possible. The two ways signals controls also only train traffic that is driving in the direction of the front side of the signal, they but do not prevent the passage of train traffic from the signal back side.
The signals you can place manually are in Train Fever only meant to act as entrance (enter) signals. These can also useful placed at the begin of a station platform, this to direct one way train traffic into your station. The signalling system works only flawless if you place signals before a train enters an area, thus on a spot just before a switch, and never at a spot just after a train passed a switch because that is the place where in the real world the exit signals are placed. The manually placed signals co-operate with the by the a.i. placed exit signals. This means also that when the last wagon of a train drives over a switch it is the invisible exit signal belonging to that switch that sets the relevant by you manually placed entrance signals to green light. What these relevant entrance signals are is based on the route (definite by its line) a train drives. So the game a.i. acts as a self-reliant signalman.
One of the most important things you need know that the a.i. always makes the choice for the fastest (shortest) connection.. if nothing else is determined by the player. You can give the a.i. instructions to act different by toggling the one way button of the entrance signals until the a.i. shows the suggestion you wish. This works flawless (I think a way point tool is not needed) if you place the entrance signals on the proper spots along your network.