The last of the classic Zephyrs was built for the Burlington's Kansas City – Saint Louis General Pershing Zephyr route. That trainset, which contained GM's newest 1000 hp engine and conventional coupling, entered service in June 1939. The Burlington's original Zephyr trainsets remained in service in the postwar era. The railroad retired the last of its six-car sets in 1968 after using it as the Nebraska Zephyr.
