ALCO S-6
Railroad Quantity Road Number
Allied Chemical Company 1 110
ARMCO Steel 1 1202
B. Perini & Sons Construction Company 1 101
Belt Railway of Chicago 1 420
Ferrocarril Chihuahua al Pacífico 1 60
Cia Fundidora de Hierro y Acero 3 1-3
Ferrocarril del Pacífico 24 701-723
Ferrocarriles Nacionales de México 1 5300
Northern Pacific Railway 1 750
Ohio River Company ( ORCo ) 1 56
Republic Steel 3 153,317,318
Secretaria de Comunicaciones de Obras Publicas ( SCOP ) 3 7133-1,2,3
Sheffield Steel 2 15,16
Southern Pacific Railroad 70 1033-1082,4634-4645
South Buffalo Railway 6 40-45
Tennessee Copper 1 107
Upper Merion and Plymouth Railroad 1 61
U.S . Pipe and Foundry 1 38
Columbia Geneva Steel 1 1
Western Maryland Railway 2 151,152
Original owners
The Alco S-6 (specification DL 430) was a diesel-electric locomotive of the switcher type constructed by ALCO of Schenectady, New York; a total of 126 locomotives were built between May 1955 and December 1960. The S-6 was an improved version of the earlier S-5.