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The sentence "The units were ordered to be used on the intercity Bergen, Dovre and Sørland Lines, but was plagued with technical faults." needs to agree as in "were vs. was".
In sentence "The locomotives have a 3,000 kilowatts (4,000 hp) power output and a 240 kN (54,000 lbf) tractive effort, allow the locomotive to haul a six-car train.", "allow" should be "allowing".