It was designed to pull longer and faster freight trains, but the locomotive was unable to do so, since it was prone to wheel slippage.

1 was rebuilt to resolve the slippage issues, and it spent its final years in service pulling passenger trains.

Freight traffic had been growing too large for the IC's 4-6-2 "Pacific" types, and they required more speed than the railroad's 2-8-2 locomotives could manage.

1 locomotive was prone to wheel slippage, since its factor of adhesion was too low—it was unable to obtain a proper grip on the rails.

1, including to the weight equalization across the locomotive's wheels and to reduce the cylinder diameter from 27 to 24 inches (686 to 610 mm).