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Question:

How fast are trains allowed to travel in a city?

I live near austin, texas and there is a train track that runs for god know how long right through the middle of town. It runs all day and all night, which doesn't really bother me, but lately I feel like it's moving a lot faster. I can feel the floor shaking and can see mirrors shaking in my apartment on the 2nd floor! I am probably 1 mile (maybe less but idk) from the tracks and have a clear line of sight of the trains passing and they are going waaayyy over 70+mph like others have stated is their max speed. And it's been really loud lately too sounds like it's about to fly off the track. They must have a new conductor or something.So what is the top speed a train is allowed to go and is it unsafe for a train to be travelling that fast?

Answer:

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I think these sorts of drawing are really misleading. Though it is common to try to represent spacetime curvature in 2D (ie on paper) in reality what you are doing is taking projections, and the drawing often say more about the projection than what curved spacetime really is. Think of this - whereever you are in spacetime (provided its not too curved) you will measure your metre stick to be - well - 1 metre. But in a curved space as you move from A to B then the metre stick at B as measured as though it were still at A is different. Its more like sound waves than the sort of curves you see drawn. We all see sound waves drawn as a sine wave on paper. But we know that they are longitudinal - what is really going on is that the pressure at a point is going up and down - the air certainly isn't going up and down. Curved spacetime is like changing pressure in a room.
you'll see it in 2012 when the comet comes rolling in 3D torwards earth
cfa.harvard.edu/image_archive

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