Back on Track Can sleeper trains help curb Europe's air-travel emissions?

For the past several decades, it's been wildly easy-and affordable to fly from one European city to another.

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But across the continent, governments are pushing back by investing in rail travel as a low-carbon alternative. France, for example, is pouring $110 billion into its trains by 2040 and recently banned shorter domestic flights between cities where there is rail service. "A really large level of investment is required to improve the service and coverage" throughout Europe, says Gonzalo Cantabrana Fernández, s