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
https://commons.wikimedia.org/wiki/File:Funicular_layouts_(2_rails).svg#mw-jump-to-license
https://commons.wikimedia.org/wiki/File:Heidelberg_funicular_wheelset.jpg#mw-jump-to-license
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I went to a queer rave, super fun! I met up with a guy I used to tutor when he was just a wee beebee (like teenage years). So weird meeting up with him again - and also the poor fucker is so clearly an egg, and looking back I clocked it but I was also an egg?? Like I felt a kindred spirit at a time when I didn't know why or what exactly I was feeling. I dont wanna misgender, the guy is still he/him but making the /r/eggirl jokes I did in the year or so before I cracked