They were numbered 6060–6079 by CN and nicknamed "Bullet Nose Bettys" due to their distinctive cone-shape smokebox door cover.

As a result of this the mountain type had less power but more speed and served well as a general purpose workhorse.

In later years several locomotives lost the distinctive cone-shaped smokebox door cover.

In 1985 through to early 1986, Harry Home led efforts to restore CN 6060 and run it to Expo 86 in Vancouver.

6060 arrived in Vancouver on the second-to-last day of the steam exhibit, and was welcomed by an extremely large crowd of people, happy to see the success of the restoration.