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mcz@lemmy.world 5 months ago
It’s an indicator light for waste heating system.
This photo was taken in a train with a vacuum toilet (en.wikipedia.org/w/index.php?title=Toilet&diffonl…). These toilets need less water for flushing, but since the waste is stored in a low pressure environment you really don’t want it to freeze and break anything. That why it’s heated.
Also, the proper conjungation in this case is “fekaliów”, not “fekalii”.