‘It works by using magnets’ has been a description of many a perpetual motion machine. Magnets bring out the nutter in people. But they are incredibly useful, and I say that as someone who thinks ‘incredibly’ is used far too often these days.
Magnets are very good fun as toys but you need to be a bit careful with them. I have had a few accidents with them, the most recent playing with magnetic ferro-fluid, which I can vouch makes a real mess of your hands for several days. I also have some levitation toys that are extremely good fun.
http://www.telegraph.co.uk/technology/news/10235261/Inside-the-Hyperloop-the-pneumatic-travel-system-faster-than-the-speed-of-sound.html describes a futuristic high speed rail system. Well, it isn’t all that futuristic, the idea is 100 years old. But it hasn’t been built yet so it is still in the future, and is at least 10 times better than the UK’s pathetic high speed rail proposal which only floats at all if you use extremely misleading figures about costs and benefits. That is worth a small fraction if what is claimed and like all government projects will cost three times as much as claimed.
I am a big believer in magnetic train propulsion, and levitation, not least because they are proven tech. Putting the system in a tube and using rail gun tech will reduce drag enormously and allow far higher speeds. Remember, in free air, drag goes with the square of velocity and power is drag x velocity. In a tube, air can move at the same speed as the train, so drag can be reduced to almost nothing. So with low friction thanks to levitation and low drag thanks to the tube, supersonic speeds are doable. Other groups have suggested vacuum tubes, but that is not as sensible thanks to increased engineering difficulty, with big cost and safety issues.
I proposed a linear induction bike lane several years back which of course is a sort of magnetic propulsion. Nobody has built that yet. The Car in my recent sci-fi book levitates magnetically on a plasma cushion. That sounds futuristic but it was proven in principle in 1964 and is easily feasible with 2092 technology. The lift to the heroes’ base is magnetic, some of their weapons are magnetic, their pet drone orb thing and their holographic disks all rely on magnetic levitation based on plasma. I even invented magnetic carbon muscles for my heroes’ suits. They would use tiny graphene coils in a folded structure in the material to achieve strong contraction and super strength at low cost. One of the social problems they had to contend with was use of smart electronic drugs in conjunction with deep brain magnetic stimulation.
There is a lot of pseudo science that gives magnets a bad name though. Stuff like magnetic bracelets that some people wear who really ought to know better, that allegedly align the iron in your blood, and somehow it doesn’t immediately go back to random as soon as it has passed by, or magnetic descalers that align the water molecules or something, or the fuel treatment magnets that magically add lots of extra energy to your petrol. These are the stuff of nonsense. So are all things that claim perpetual motion.
But cars, trains and bikes, yep, they can all be made magnetic very usefully indeed. And carbon muscle fabric. And all sort of levitation systems. The future is magnetic, even if a lot of nutters say the same thing.