Abt switch
The Abt switch is a kind of railway switch used on funiculars (inclined cable railways) that doesn't have any moving parts. It allows two cars to pass each other going uphill/downhill while sharing the same tracks. While most train switches rely on physically moving a section of track so the train goes one way or the other, the abt switch doesn't move at all. Instead each carriage has a grooved wheel which makes it turn left or right at a junction by sticking to the track on one side.
spoiler Image sources https://commons.wikimedia.org/wiki/File:Funicular_to_Horseshoe_Curve_viewing_area_(8999490400).jpg#mw-jump-to-license
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https://commons.wikimedia.org/wiki/File:Funicular_layouts_(2_rails).svg#mw-jump-to-license
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https://commons.wikimedia.org/wiki/File:Heidelberg_funicular_wheelset.jpg#mw-jump-to-license
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I'm not sure if it goes this deep, but in lore tieflings are often mistrusted and ostracized just for the nature of their existence so there's, y'know, some resonance there. There also may be some crossover with reclamation of satanic iconography and such, in the same vein as like rainbow baphomet.
But, idk, personally I just think they're cool. Tieflings are queer.
(I also personally like the juxtaposition of being a tiefling paladin or a tiefling light cleric, but that may also just be because I was a draenei main in wow)
I also played my share of tiefling paladins lol