sentences:  The other two locomotives would remain at the Otira electric locomotive depot, although any one of the two spare units could be sent to Addington Workshops for an overhaul as required.They were mostly used to haul freight trains, although they did occasionally haul passenger trains either on their own or in multiple with the diesel locomotive pulling the train.Originally the locomotives were classified as the EA class until the early 1980s when they were reclassified into the EO class.