After Union Pacific exited the passenger business in 1971 the Auto-Train Corporation purchased most of the fleet and operated them for an additional ten years.

[7]: 66  The Union Pacific gave great publicity to the novelty of dome dining cars operating between Chicago, Portland, Oregon and Los Angeles.

[8]: 213–214 Union Pacific later ordered an extra five coaches from Pullman-Standard, numbered 7011-7015 in 1958 which were assigned to the City of St. Louis.

After the Union Pacific exited the passenger business in 1971 it sold two of the dome coaches (#7004 and #7008) to the Alaska Railroad for use on its AuRoRa streamliner.

The current Astra Dome cars in the Union Pacific Heritage fleet include: