Finnish railway signalling
The signalling system used on the railway network in Finland comprises color-light signals and fixed signs, used together with the Automatic Train Control system ATP-VR/RHK (an EBICAB 900 system better known as JKV, Finnish: junakulunvalvonta). == Main signals == The main signal can have any of the following aspects: If a main signal doesn't protect any switches or the speed restriction on a diverging route is the same as straight route, the signal doesn't need to show the Proceed 35 aspect and therefore the yellow bottom light may be absent.
Source: Wikipedia — Finnish railway signalling (CC BY-SA 4.0)