While the growing number of passenger cars is cited as an issue, environmental regulations for cars are already strict.
The total number of passenger miles increased from under 1.5 trillion a year in 1980 to 2.4 trillion in 1995.
Train operators are running 1, 000 extra services a day while the number of passenger journeys has increased by nearly 100m in the past two years.
Since the 1970s, through oil shocks, Middle East wars, terrorist attacks and disease outbreaks, the number of passenger-miles flown seems always to have snapped back to its long-term growth trend (see chart 1).
When a traveller enters an airport with one of these smart cards, sensors read the passenger's card and automatically send a gate number and electronic boarding pass to the passenger's smartphone.
The Paris airports company, ADP, said a large number of incoming passenger planes heading for Charles de Gaulle had either being turned back or rerouted towards other airports.
Anthony Smith, chief executive of passenger group Passenger Focus, said with the number of rail-users continuing to grow, there was a long-term need to boost the capacity.
"As passenger and train numbers rise, the number of challenges increase and it becomes more complex than ever to run a reliable and cost-effective railway, " he said.
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But that will depend on persuading all EU countries to share passenger and crew list information - quite a number of them regard this as illegal under European free movement laws.
Since 2006, when 1, 417 unruly passenger incidents were reported to the TSA, the number has fluctuated on a mostly downward trend, hitting 1, 218 in 2011.
He increased the number of coaches, both for goods and passenger trains, from 16 to 24.
It noted that the sales of those vehicles hit 488, 000 in 2012 and represented 3.2% of the passenger car sales in the U.S. That number fell short of the expectations by carmakers and their suppliers, including lithium-ion battery makers.
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For example, a passenger flying into the UK on a American Airlines flight, but who actually booked with BA and has a BA flight number will get the same rights as a BA passenger.
Train World curators, meanwhile, have been grappling with the vast number of pieces they have uncovered: 208 locomotives, passenger and freight cars.
In the most recent month, just over 1.1 million passenger cars were sold, up 5.3 percent from the number of units sold in October 2011.
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However there are still a number of reservations that biometric systems will provide an enhanced passenger experience at airports and maintain high standards of security.
Evidently Delta is not worried about it because not only is the number printed but also the record locator number for the reservation and of course the name of the passenger.
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The Transportation Department's statement said it has doubled the number of bus inspections of the nation's estimated 4, 000 passenger bus companies, from 12, 991 in 2005 to 28, 982 in 2011.
The company said over the last 10 years, the number of trains on the line has increased, reflecting a significant increase in passenger use.
It now has nine Airbus A330 passenger jets in its fleet and is taking delivery of seven more this year and an equal number next year.
In the meantime, the number that really matters--called the "yield, " or the price a passenger pays to fly one mile--fell 4.5%.
Passenger numbers fell by 400, 000 during the Olympics, as Britons stayed home to enjoy the Games and the number of inward-bound travellers dipped.
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