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Today we talk about escalators.\nThe Slides:\xa0https://youtu.be/ciF1p_GMrmw\nThe Patreon: https://www.patreon.com/wtyppod \nimage credits:\nmet steam loco By Hammersfan - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=79896458 \ntube train By SPSmiler - Own work, Public Domain, https://commons.wikimedia.org/w/index.php?curid=400148 \nreno-type escalator stolen from https://www.flickr.com/photos/63151554@N00/8772641035 \nmacys wooden escalator By Xiaphias, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=16078738 \ngreenford escalator By Billy Hicks - Taken by myself using digital camera., CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=1128884