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Hey, I just copied and pasted Oliver Keatings words. He did say the train would decelerate. Yet, steel wheels on steel rails have less resistance than rubber on concrete. And yes, trains use a lot less energy than jet aircraft. More from Oliver Keating: You would think aircraft could compete with ticket prices in Europe. This is very difficult. Aircraft are very expensive to build and maintain, much more than trains. The most expensive train in the world is the Eurostar at $40,000 a seat. Most aircraft by comparison are $200,000 per seat! Trains do have costs such as paying for the railway lines which are expensive, then again, so are airports, and airlines have to pay airports a lot of money. (Landing charges). Also there is energy, aircraft consume a hidious amount of fuel when compared to trains, which has to be paid for. As a result operating costs for airlines two to three times higher than for trains. Offering a cheap and cheerful service isn't possible. Trains do have air resistance, but the faster you go the more air resistance you face. As a result the faster you travel the more energy you consume between two points since energy=force x distance. Now one advantage of aircraft is they climb to where the air is thinner, so air resistance is 40% less. But because they go 300% faster than trains, its not a benefit. Also the design of aircraft makes them more prone to air resistance… they rely on air resistance to stay in the air. Aircraft use a lot of fuel to climb about 10km or 7 miles (30,000ft) into the air. The Jet engine is always going to be innefficient too, because it relies on blasting burnt fuel out of the rear. This means that the vast majority of energy goes speeding up the air. It doesn't divide 50/50 because kinetic energy is a function of the square of velocity (double speed quadruple energy). So most of the energy is used to make a huge hurricane with a little left for the actual aircraft. Another reason why it is innefficient is because it relies heat… so you get a hot hurricane! Not only that but because there are so many moving parts there is a huge amount of noise. In short, noise, heat, wind come out of the jet engine as wasted energy, meaning only about 10% left goes into making the aircraft go. Electric trains on the other hand don't make noise greater than conversation volume even at full power, although motors get hot they don't reach thousands of degrees, and they don't produce 1,000 mph winds. As a result power efficiency is very high, in the 40%-60% of the energy goes into making the train go.
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