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This alarm signal was not military issue, but as a nice pyrotechnic I placed it here with mines.
It was manufactured by JNS Leeuwarden, NL.
It was used by the NS "Nederlandse Spoorwegen" to be placed at a distance of people working on the railroad track.
When the train went over this, a loud signal could be heard and the driver was alarmed to slow down and stop the train.


Photos © M. Jochoms.






These three photos only differ in markings from the above.

Photos © M. Jochoms.





A similar alarm can be found HERE (german), and another model HERE (UK)