Number 9767 was built in October 1930 by Pullman ( body c/n 458 ), powered by an EMC No. 148 400 horsepower diesel. Originally built with a 15 foot mail apartment, it was converted in 1930 by the CB&Q to a 30 foot mail apartment.Like all self-propelled cars, the 9767 has a varied and interesting career, though perhaps more distinguished than most. In her later years she was painted a distinctive silver gray and pulled one of the finest riding cars on the system, the Silver Pendulum, between Saint Joseph and Brookfield, Missouri, where the train connected with the Kansas City Zephyr. When this passenger train was discontinued, both the 9767 and the Silver Pendulum were moved to Lincoln, Nebraska to become the Lincoln - Saint Joseph via Wymore Local passenger. Motor failure due to a broken connecting rod did severe damage to the diesel and the 9767 was taken out of service in December 1961. The PMC body waqs set on the ground at Beardstown, Illinois to serve as an enginemen's locker room. However the Silver Pendulum, built in 1941, saw more service.

"Pendulum car truck is designed to support the car body 14 inches above the center of gravity and secure easy riding around curves at high speed." There is a photo to go with that statement showing the truck, and it appears that the springs and stabilizers extend upward into the carbody a couple of feet, which probably explains the lack of windows over the truck centers.