maglev train - maglev train you want to have an industry, you have to move materials to it and from it. Therefore, you require an efficient transportation system which has a low physical cost of transportation per ton of weight. The most efficient, of course, is rail--rail or magnetic levitation--the lowest in the cost, physical cost per ton mile. Roads are very inefficient, and the only time you use roads, is when it is inefficient to build rail. And you try to use them only for very short distances, because they're very costly, per ton mile, relative to rail. Rail is much cheaper. Water is the cheapest, but that's not land. But, water is slow.