How a Train Stays on a Track (not as simple as you thought)
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Stumble ThisPhysicist Richard Feynman explains how a train stays on the tracks... From BBC TV 'Fun to Imagine' (1983) -YT
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Genius: The Life and Science of Richard Feynman Book added by: cybrbeast 
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Classic Feynman: All the Adventures of a Curious Character Book added by: cybrbeast
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he just doesn't believe in the awesome power of Jesus Christ, our god and savior and train straightener!
ok, so what keeps a monorail on track?
Gyro monorail
http://en.wikipedia.org/wiki/Gyro_monorail
Also very ingenious.
"Classic Feynman" (a combined and expanded version of "Surely You're Joking, Mr. Feynman!" and "What Do You Care What Other People Think?")
http://www.amazon.com/Classic-Feynman-Adventures-Curious-Character/dp/0393061329/
For the real physicists out there, there is the book "Genius" which combines biographical info with descriptions of his theories and nobel prize winning work.
http://www.amazon.com/Genius-Life-Science-Richard-Feynman/dp/0679747044/
'Tis a shame
And what fraternity is that? Is there some secret organization of people that Know How Stuff Really Works?
train
*wheels
are tapered to keep the train on the track
...to become full-fledged members of the fraternity.
ok, so what keeps a monorail on track?
Magnetism - Not all so called monorails actually ride on wheels!
My Favorites:
1). The Meaning of It All: Thoughts of a Citizen-Scientist
2). The Character of Physical Law
3). Feynman's Lost Lecture: The Motion of Planets Around the Sun
The first two are fairly easy reads, I highly recommend them!
The third one had some math. It comes with a n audio CD of the actual lecture and the book includes a walk through and explanation of the entire lecture. Even if you don't understand the math involved, it's a great lecture. I listened to it with a pencil and a stack of blank paper so I could draw along with it. I was able to follow along, albeit slowly but then advanced math is not a strong part of mine.
Mind = blown
Once again, the massive scope to which I do not know about this world, humbles me.
ok, so what keeps a monorail on track?
Mostly, horizontally mounted wheels that grab onto the sides of the monorail.