Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Ak-Sar-Ben Zephyr was a named passenger train operated by the Chicago, Burlington and Quincy Railroad as "Burlington Route" train No. 5 eastbound and train No. 30 westbound. The Ak-Sar-Ben Zephyr was the overnight version of its daytime sister train, the Nebraska Zephyr, which operated over the same route. The "Ak-Sar-Ben" portion of name was created by spelling Nebraska backwards; a fraternal organization and an arena and horse racing facility in Omaha have also used the name.