SP No. 1231 at El Centro, California, in 1970
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.
Visually indistinguishable from the S-5, the S-6 used an ALCO 251A or 251B prime mover rated at 900 horsepower (670 kW). The locomotive rode on two-axle AAR trucks, giving a B-B wheel arrangement. ALCO produced a cow-calf variant for the Oliver Iron Mining Company designated SB-8/SSB-9.
|Allied Chemical Company||1||110|
|B. Perini & Sons Construction Company||1||101||to Upper Merion and Plymouth Railroad 101|
|Belt Railway of Chicago||1||420|
|Ferrocarril Chihuahua al Pacífico||1||60||Renumbered 106|
|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||to Burlington Northern Railroad 950|
|Ohio River Company (ORCo)||1||56|
|Secretaria de Comunicaciones de Obras Publicas (SCOP)||3||7133-1,2,3||to Ferrocarril del Sureste (same numbers)|
|Southern Pacific Railroad||70||1033–1082,4634–4645||renumbered 1200–1257, 1270–1281|
|South Buffalo Railway||6||40–45|
|Upper Merion and Plymouth Railroad||1||61|
|U.S. Pipe and Foundry||1||38|
|Columbia Geneva Steel||1||1|
|Western Maryland Railroad||2||151,152|
|Ferrocarriles Unidos de Yucatán||1||301|
|Wikimedia Commons has media related to ALCO S-6 locomotives.|
- Sarberenyi, Robert. Alco S5, S6, and SSB9 Original Owners.
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