Today we talk about escalators.

The Slides: https://youtu.be/ciF1p_GMrmw

The Patreon: https://www.patreon.com/wtyppod

image credits:

met steam loco

By Hammersfan - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=79896458

tube train

By SPSmiler - Own work, Public Domain, https://commons.wikimedia.org/w/index.php?curid=400148

reno-type escalator

stolen from https://www.flickr.com/photos/63151554@N00/8772641035

macys wooden escalator

By Xiaphias, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=16078738

greenford escalator

By Billy Hicks - Taken by myself using digital camera., CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=1128884