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Your statements don't make sense. The track is not flat, it follow the curvature of the ball. The train thusly also follows the curvature. And yes, if it were in a zero-gravity environment, with no atmospheric pressure, you probably wouldn't need any energy keeping the train in motion. But here on Earth, there's friction due to the downwards force (gravity), air resistance and all the moving parts that consume energy, so to keep the train in motion you need energy.

Gravity can't be measured? What do you mean? You can precisely calculate and measure this force that attracts every mass to every other mass in the universe.

Train track is flat according to ball earthers, yet they also think it bends to follow the curvature of the earth somehow.  Either it's level or it bends, ball earthers want it both ways. They can't have it both ways. My explanation is exactly as I meant it to be and if read as it is stated, without prejudice, makes perfect sense as an answer to someone.  Atmospheric pressure has no bearing here.  We're talking about level and curve which ball earth people somehow equalize.  If a train track is truly level, as in straight and flat and without bend, it cannot extend for hundreds of miles on a ball without exceeding the "gravitational level" pretense, nor would said track stay on the ground but wind up miles above ground because the track is straight but earth is curved.  But that never happens because earth is not curved. I said it every way possible before, this is just another way of stating facts.  Gravity cannot be measured, even according to authorities.  They have theories according to "planetary" objects, but even then, it isn't consistent because certain bodies defy "gravity" and there's no explanation for why.  In other words, "gravity" is a seriously flawed theory.  I'm not saying things don't fall at a certain rate, they do.  But that is totally different than the said gravity that attracts celestial objects together.  Even then, with all the lies coming out of the scientific community, we really don't know how that works, or if it even exists.   

Isn't is another unproven fallacy that gravity comes from the center of the earth?  Round earth depends on this foundation.

I always was told the spin provided "gravity", so who knows with these ridiculous scientists always spouting contradictory things and floating them as fact.  The whole Rona, mask and jab debacle is clear evidence this kind of bait and switch nonsense is practically a given.