The Rocky Mountain Rocket was a streamlined passenger train of the Chicago, Rock Island and Pacific Railroad.

The Rock Island's offering was the Rocky Mountain Limited, operating traditional heavyweight cars on a 27-hour schedule.

[5] Facing steep competition from airlines and improved highways, the Rocky Mountain Rocket lost its sleeping and dining cars in July 1965.

Snack cars were added to replace the diners and remained in service until the train was discontinued 15 months later.

In 1970, the train was renamed the Quad Cities Rocket after its western terminus was cut all the way back to Rock Island, Illinois.

[7] Both Budd and Pullman-Standard contributed cars to the inaugural equipment sets used by the Rocky Mountain Rocket.

The sleeper-observation contained five bedrooms toward the front of the car, followed by a small lounge and round-end observation area.

The AB6s, unique to the Rock Island and this route, were flat-fronted, similar to a B unit, but with a cab and capable of independent operation.

It could operate behind an A unit without ruining the streamlined profile of the train, but then pull the Colorado Springs section after the separation in Limon.