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Physics/Lift or Escalator for Metrorail.


Dear Prof Steve

Which will be a better Choice for Metrorail?. Is it Lift or Escalator?.


Hello Prashant,

If the station is one that unloads a large number of people during rush hour, I believe the average Escalator will get all the people to the surface in a shorter time than the average Lift. A station in the outskirts may seldom have a larger group of people going up or down than a Lift can accommodate at one time, so the Lift may be the better choice there. I don't know which is more expensive, but that should also be considered.

I hope this helps,


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Steve Johnson


I would be delighted to help with questions up through the first year of college Physics. Particularly Electricity, Electronics and Newtonian Mechanics (motion, acceleration etc.). I decline questions on relativity and Atomic Physics. I also could discuss the Space Shuttle and space flight in general.


I have a BS in Physics and an MS in Electrical Engineering. I am retired now. My professional career was in Electrical Engineering with considerable time spent working with accelerometers, gyroscopes and flight dynamics (Physics related topics) while working on the Space Shuttle. I gave formal classroom lessons to technical co-workers periodically over a several year period.

BS Physics, North Dakota State University
MS Electrical Engineering, North Dakota State University

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