Zgodnie z definicją E1 – sygnały na tarczach zaporowych należą do sygnałów zamknięcia toru - z podanego kontekstu

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Signals of closing of the track, and way signals (temporary signals) - http://grzegorj.cba.pl/kolej/signals.html

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Track-closing signals are simple signs, which inform about inability of entering the particular track. In some cases standard 'dead-end' sign is replaced by the light-signal reflecting permamently S1 signal ('stop'). When Z1-group signal is reflected, it means passing it it strictly prohibited. Dead-end signs always colaborate with other signals (for example Z2o [entering the turntable allowed] signal is followed by M2 ]'shunting allowed']). - http://jareks.zonk.pl/signal/closing.htm

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Note added at 7 hrs (2015-10-20 14:00:13 GMT)
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The signal device of a derailer, showing aspect Sh 0 (a line-close signal).
The standard position for this derailer is "derailer on, line closed" as you can see by the black part of the operating lever facing down (standard position is black downwards: "dirt facing dirt"). - http://www.sh1.org/fotos/mech.htm

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Note added at 7 hrs (2015-10-20 14:06:51 GMT)
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Protection Signals - http://www.sh1.org/eisenbahn/snsh.htm

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On freight yards or freight tracks Group Exit Signals may be used. This is a single signal placed after the last point where all tracks it governs join. Additionally at the end of each individual track a high line-close signal (Sh 0/1) is placed to be able to show which track exactly is cleared with the group exit signal. - http://www.sh1.org/eisenbahn/rups.htm

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aspect Sh 0 (a line-close signal).