Rail carriers are under pressure to lower greenhouse-gas emissions. Here are some of the alternative technologies they are considering.
The freight-rail industry is facing pressure to find cleaner alternatives to its traditional diesel-electric locomotives.
Railroad operators like to say that trains are greener than trucks when it comes to moving goods, pointing out that one railcar can haul three to four times as much as a truck, and one freight train can remove hundreds of trucks from the highways.
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