Tuesday, March 6, 2012

Magnetic Levitation Trains

By Owen Jones


Magnetic levitation or maglev for short is the method of making a means of transport, more frequently than not a train, hover over the 'track' and travel by the use of magnets. Magnetic levitation has the potential to move trains more quickly and more quietly than conventional wheel-based trains. Surprisingly, most of the power consumed is used to overcome wind resistance at high speed, not to keep the train suspended in mid-air.

You would be forgiven for believing that maglev is new technology, but in fact the first American patent was filed by a German inventor in America in 1907. It then took 74 years before the first commercial maglev train came into service in 1984 in Birmingham, United Kingdom. However, that particular installation became fairly unreliable and it was withdrawn in 1995.

The highest recorded speed of a maglev train under test circumstances was in Japan in 2003. It ran at an impressive 361 mph, but that is just 3.5 mph faster than France's TGV, which has been in existance for four decades. The TGV's top speed of 357.2 mph was beaten by the Chinese Harmony Express in 2009.

However, these latter day wheeled services are based on tried and tested technology on which hundreds of billions of dollars has been spent over nearly 200 years. If more attention and investment were lavished on the maglev, it would surpass conventional train speeds fairly easily.

The most flourishing maglev train in operation these days runs to Shanghai airport like the British one ran to Birmingham Airport. However, the similarity between the two stops there. The British maglev travelled at up to 26 mph, whereas the Chinese, but German built, maglev runs at a peak speed of 160 mph.

A lot of the early research and development was carried out in Britain by Professor Eric Laithwaite from after the Second World War to 1973, but Germany is the foremost influence on the maglev train now, even though Germany is working closely with the Chinese and the Japanese to develop the technology.

One of the main stumbling blocks for maglev trains is infrastructure. Maglev trains are incompatible with traditional rail rack so they have nowhere to go. Laying new maglev track is not hideously costly, but it is dear and would involve having two sets of incompatible rails running alongside each other for several decades, which would naturally take up twice as much land.

Having said that, some advancement was achieved in designing rails that could be used by both technologies but the endeavour was allowed to fall fallow.

So, the story of magnetic levitation trains started with a German inventor over a hundred years ago and although they lost track of the project for thirty years or so during and after the War, German scientists and engineers are back at the forefront of this fascinating technology, which will surely replace our conventional train and track technologies in the future.

If the electricity required to run them were manufactured by methods other than fossil fuel, these very quiet trains would go a long way to decreasing pollution in both inner cities and the countryside.




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