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There were some differences between the S-2 and S-4 carbodies. The S-4 had a more welded carbody and less riveted construction. Also rubber moldings were installed on all the windows. See page 310 The American Locomotive Company A Centennial Remembrance by Richard Steinbrenner. -- SSW9389 19:33, 4 October 2007 (UTC)
The last S-4s were built in 1956-1957. They were a part of a 40 unit construction order. All but three of these units were sold during the same period. The last of these leftover S-4s was sold in January 1961. That is why you have a date of 1961, it is a sale date and not a production date. See page 384 The American Locomotive Company A Centennial Remembrance by Richard Steinbrenner. -- SSW9389 19:33, 4 October 2007 -- SSW9389 19:33, 4 October 2007 (UTC)(UTC)
DSG2 has the last 539 engine being built in 1957, probably should be later as NdeM had RS-1s delivered in late 1959 early 1960. See above note on S-4s, the last S-4 was built in 1957 and not sold until January 1961 to Altos Hornos in Mexico! Other very late S-4s to Genesee & Wyoming and to Angelina and Neches River. The 251B engined T-6 switchers replaced the 539 engined S-4 in ALCOs diesel catalog. Data also from Steinbrenner pp.384-385 -- SSW9389 ( talk) 20:36, 21 May 2008 (UTC)
The first S-4s were Canadian Pacific 7099-7105 7 76469-76475 6/49 per the linked roster on Diesel Shop. Steinbrenner adds that MLW built 34 S-4s in 1949, see pages 280-282. --SSW9389 16:27, 1 January 2009 (UTC) —Preceding unsigned comment added by SSW9389 ( talk • contribs)
Where does the 4/40 production date for the S-2 come from? The linked roster on Diesel Shop shows 8/40 for South Buffalo #71 and 9/40 for SP&S #20-21 as the earliest units. Steinbrenner uses 9/40 in his book. Was there a demonstrator that preceeded these first three production locomotives? --SSW9389 16:38, 1 January 2009 (UTC) —Preceding unsigned comment added by SSW9389 ( talk • contribs)
Dorin, Patrick C. (1972). Chicago and North Western Power. Superior Publishing. p. 136. ISBN 0-87564-715-4. has C&NWRy drawings and spec sheets for their loco’s, that’s where most of this comes from. Sammy D III ( talk) 19:06, 22 August 2013 (UTC)
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There were some differences between the S-2 and S-4 carbodies. The S-4 had a more welded carbody and less riveted construction. Also rubber moldings were installed on all the windows. See page 310 The American Locomotive Company A Centennial Remembrance by Richard Steinbrenner. -- SSW9389 19:33, 4 October 2007 (UTC)
The last S-4s were built in 1956-1957. They were a part of a 40 unit construction order. All but three of these units were sold during the same period. The last of these leftover S-4s was sold in January 1961. That is why you have a date of 1961, it is a sale date and not a production date. See page 384 The American Locomotive Company A Centennial Remembrance by Richard Steinbrenner. -- SSW9389 19:33, 4 October 2007 -- SSW9389 19:33, 4 October 2007 (UTC)(UTC)
DSG2 has the last 539 engine being built in 1957, probably should be later as NdeM had RS-1s delivered in late 1959 early 1960. See above note on S-4s, the last S-4 was built in 1957 and not sold until January 1961 to Altos Hornos in Mexico! Other very late S-4s to Genesee & Wyoming and to Angelina and Neches River. The 251B engined T-6 switchers replaced the 539 engined S-4 in ALCOs diesel catalog. Data also from Steinbrenner pp.384-385 -- SSW9389 ( talk) 20:36, 21 May 2008 (UTC)
The first S-4s were Canadian Pacific 7099-7105 7 76469-76475 6/49 per the linked roster on Diesel Shop. Steinbrenner adds that MLW built 34 S-4s in 1949, see pages 280-282. --SSW9389 16:27, 1 January 2009 (UTC) —Preceding unsigned comment added by SSW9389 ( talk • contribs)
Where does the 4/40 production date for the S-2 come from? The linked roster on Diesel Shop shows 8/40 for South Buffalo #71 and 9/40 for SP&S #20-21 as the earliest units. Steinbrenner uses 9/40 in his book. Was there a demonstrator that preceeded these first three production locomotives? --SSW9389 16:38, 1 January 2009 (UTC) —Preceding unsigned comment added by SSW9389 ( talk • contribs)
Dorin, Patrick C. (1972). Chicago and North Western Power. Superior Publishing. p. 136. ISBN 0-87564-715-4. has C&NWRy drawings and spec sheets for their loco’s, that’s where most of this comes from. Sammy D III ( talk) 19:06, 22 August 2013 (UTC)