In 1919, Baldwin built ten large 0-8-8-0 Mallets for the PRR. They were designated CC2s and like the CC1s prototype of 1912, they were intended as switchers on the hump yard, as pushers and for transfer services. There they had to run over grades of five percent and through tight curves. By designing the locomotive without leading or trailing axles, all the weight was used for adhesion. Curve negotiation was guaranteed by tight spacing of the relatively small wheels on each group.

Compared to the CC1s, the CC2s had a larger boiler, larger cylinders and smaller drivers with a diameter of only 51 inches. In the result, the starting tractive effort was nearly 100,000 pounds. In contrast to most PRR locomotives, they had no Belpaire firebox. Anyway, their fireboxes had a combustion chamber and arch tubes. They were scrapped between 1947 and 1949.