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对伊加线双机牵引改为单机牵引特快旅客列车提出了理论依据。并经过3个多月的牵引试验，充分证明单机牵引是可行的。
It puts forward the theoretical basis that the double-tractor of Ica line changed to the single tractor express passenger train. And after more than three months of traction test, fully proved that single traction is feasible.