Between 1954 and 1957 the Bipolars saw decreased use, and in mid-1957 were transferred off the Coast Division to the Mountain Division. Their problems persisted; moreover, passenger train speeds in the Rockies (over in some locations) were generally in excess of the Coast's top speed of , further exacerbating these problems. Between 1958 and 1960 all five were gradually retired, by which time they had received the Union Pacific-inspired yellow and gray passenger paint scheme. In 1962 all except for E2 were towed to Seattle and scrapped.