[Luke Towan] has a cool HO scale Escalator mostly made of 3D printed parts, with some laser cut acrylic, for a station on his HO model railroad. Escalators are mesmerizing to watch – there’s ...

Like Ames, Souder never built a model of his invention. He’d later patent three other proto-escalator designs ... control their speed depending on the size of the crowd or even stop when ...