Rail-freight capacity will be more than doubled, from today's 20m tonnes a year to 52m, and passenger journeys shortened by 90 minutes.

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Since it takes two years to build a container ship, freight capacity is inflexible, so small changes in demand can cause marked changes in price.

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Just as we experienced with the fiber-optic cable build-out, there was soon too much railroad capacity, and freight prices fell.

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Freight ferries are running close to full capacity.

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And in the next version of the National Infrastructure Plan, it might want to provide a proper vision for the development of the country's infrastructure networks covering energy generation and transmission, South East runway capacity, national and international freight connectivity and high-speed communication networks.

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With freight, and assuming only 30% of departing capacity is used, there would need to be only 3 747s a day visiting: one every 6 hours.

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That has blurred the line between express services and air freight, and led to increasing use by integrators of spare hold capacity on passenger planes.

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The Columbia and Snake River system allows large volumes of freight to be moved with negligible impact on air quality, and replacing this transportation capacity would require use of 120, 000 rail cars or 700, 000 trucks.

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