95% of all switch heating systems are automated. In the foreground is the weather station and control unit. At the rails are the connections for gas (black), electric (red) and rail-temperature sensor. The big pipe is the temperature sensor. With the measurements of air temperature, precipitation/snow, humidity and rail temperature, three programs are controlled. Operating at precipitation: Activated below 2.5°C and off above 3.5°C. Operating at dryness: Activated below -10°C and off above -8°C. Operating morning: Activated below -5°C. Rorschach Hafen, Switzerland, March 4, 2016. (2/3)
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/70981241@N00">Kecko</a> from Rural area, Eastern Switzerland
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/kecko/25561070885/">SBB - Gas Switch Heater</a>