Tags: Locomotive.
Southern Pacific Railroad’s AC-2 class of steam locomotives was the second in the AC series of cab forward locomotives built for Southern Pacific (SP). This class consisted of locomotives that were rebuilt from Baldwin-built SP MC-4 class locomotives by 1930.The rebuild from MC-4 class gained the locomotives about 5000 pounds-force (22 kN) in tractive effort but also increased the locomotives’ weight by about 50000 pounds.