据运输部估计许多货运列车已经超过他们理论上的运载能力，从而使铁路运输交通变得拥挤不堪。
The Department of Transportation estimates that many are already exceeding their theoretical capacity and are congested.
据运输部估计许多货运列车已经超过他们理论上的运载能力，从而使铁路运输交通变得拥挤不堪。
The Department of Transportation estimates that many are already exceeding their theoretical capacity and are congested.
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