A Czech version of a mobile toilet - Chrustenicka Iron Mine
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That is very similar to what I remember at Wheal Jane in 1980. I think the Wheal Jane units had a square tank.
I was told a story about one unfortunate user being propelled at speed along the track by a loco. He was obviously not in a position to do anything except hang on to the conveniently placed grab handles.
I'd assumed they were "straining" handles.
Dual purpose handles, ttxela.
Obviously a proper ergonomic design, with contrasting colours for enhanced visibility.