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=== S3 signal on automatic block signals ===
S3 signal on automatic block signal with W1 sign means, that the home signal of the station is showing a proceed with reduced speed to 40 km/h / 60 km/h or is showing a stop signal.

Same signal on last automatic block signal ( With W18 sign ) means that the home signal is showing proceed with speed reduced to 100 km/h signal ( S6, S7, S8 or S9 signal - always with steady lower orange light and green light bar ) or that the semaphore after the home signal is displaying a stop signal ( S5 signal on semi - automatic signal ).

On three-state signals S3 aspect is shown only on last automatic signal ( with W18 sign )

== Bibliography ==
* [https://pl.wikipedia.org/wiki/Semafor_(kolejnictwo) Wikipeda]
* [[Instrukcja_Train_Driver_2_(instrukcje_kolejowe)]]
* [https://up.td2.info.pl/f/08688cf3f1fc47e2aae8/?dl=1 Przepisy kolejowe: instrukcja sygnalizacji Ie-1]