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In page Dalston Kingsland railway station:

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At Dalston Kingsland station the NLL was powered by both 25 kV overhead AC and 750 V third-rail DC systems and was the change-over point between current collection by pantographs and by shoes for passenger trains that are dual-system Class 378 electric multiple units (EMUs). For reliability, time-saving, and as part of the NLL upgrade, the third rail has now been removed and overhead cables power the North London Line between Stratford and Acton Central.