https://wiki.sarg.dev/index.php?action=history&feed=atom&title=ALCO_DH643 ALCO DH643 - Revision history 2026-06-12T04:00:24Z Revision history for this page on the wiki MediaWiki 1.44.2 https://wiki.sarg.dev/index.php?title=ALCO_DH643&diff=782286&oldid=prev imported>MichaelMaggs: Fix invalid character 2025-11-05T13:44:25Z <p>Fix invalid character</p> <p><b>New page</b></p><div>{{Short description|Twin-engine diesel-hydraulic locomotive}}<br /> {{Use mdy dates|date=November 2025}}<br /> {{Infobox locomotive<br /> |name = ALCO C-643DH<br /> |powertype = [[Diesel locomotive#Diesel-hydraulic|Diesel-hydraulic]]<br /> |image = Southern Pacific -9152.jpg<br /> |caption = Southern Pacific #9152, formerly #9020.<br /> |builder = [[American Locomotive Company]] (ALCO)<br /> |ordernumber = S-3374<br /> |serialnumber = S-3374-01 – S-3374-03<br /> |buildmodel = DH-643<br /> |builddate = September 1964<br /> |totalproduction = 3<br /> |aarwheels = C-C<br /> |uicclass = [[C′C′]]<br /> |gauge = {{track gauge|ussg|lk=on}}<br /> |length = {{convert|75|ft|10|in|m|2|abbr=on}}<br /> |locoweight = {{convert|378000|lb|kg|abbr=on}}<br /> |primemover = [[American Locomotive Company|ALCO]] [[ALCO 251|12-251C]], (x 2)<br /> |enginetype=[[V12 engine|V12]] [[Four-stroke]] [[Diesel engine|diesel]], (x 2)<br /> |aspiration = [[Turbocharger]]<br /> |displacement = {{convert|8016|cuin|L|abbr=on}}<br /> |cylindercount = 12 (x 2)<br /> |cylindersize = {{convert|9|×|10+1/2|in|mm|0}}<br /> |transmission = [[Voith]] [[Hydrokinetic transmission|hydraulic]]<br /> |maxspeed = {{convert|77|mph|abbr=on}}<br /> |poweroutput = {{convert|4300|hp|kW|abbr=on|lk=in}}<br /> |tractiveeffort = {{convert|95000|lbf|kN|2|abbr=on|lk=on}}<br /> | locobrakes =[[Railway air brake|Straight air]]<br /> | trainbrakes =[[Railway air brake|Air]]<br /> |operator = [[Southern Pacific Railroad]]<br /> |fleetnumbers = 9018–9020 (later 9150–9152; final 9800-9802)<br /> |locale = [[North America]]<br /> |scrapdate = 1973<br /> }}<br /> <br /> The &#039;&#039;&#039;ALCO C-643DH&#039;&#039;&#039;, also known as the &#039;&#039;&#039;Century 643DH&#039;&#039;&#039;, was a twin-engine [[diesel-hydraulic locomotive]], the first diesel-hydraulic [[road switcher]] built in the United States. It had a [[AAR wheel arrangement#C-C|C-C]] wheel arrangement and generated {{convert|4300|hp|lk=in}}. Only three were built, all for [[Southern Pacific Railroad]] in 1964 (#9018&amp;ndash;#9020). The Alco C-643DHs joined 21 [[Krauss-Maffei]] [[KM ML-4000|ML-4000]] diesel-hydraulics already on the Southern Pacific&#039;s roster. They spent most of their service lives in the flat [[San Joaquin Valley]] in California.<br /> <br /> Dissatisfaction over the poor performance of diesel-hydraulic locomotives, as well as their use of foreign-made components (the [[Hydrokinetic transmission|hydraulic transmission]] was of [[Germany|German]] [[Voith]] design), eventually led Southern Pacific to sell the 3 C-643DHs for scrap in 1973. None of the 3 examples built survived into preservation.<br /> <br /> ==Original owners==<br /> <br /> {| class=&quot;wikitable&quot;<br /> ! Railroad !! Quantity !! Road numbers !! Notes<br /> |-<br /> |[[Southern Pacific Railroad]] ||style=&quot;text-align:center;&quot; |3 || 9018–9020 || renumbered 9150–9152<br /> |-<br /> |}<br /> <br /> == See also ==<br /> * [[List of ALCO diesel locomotives]]<br /> * [[ALCO Century 855]]<br /> <br /> ==References==<br /> * {{cite web|title=ALCO 244 and 251 Diesel Engines|work=Pacific Southwest Railway Museum|url=http://www.sdrm.org/roster/diesel/alco/index.html|accessdate=20 February 2006 | archiveurl= https://web.archive.org/web/20060113221802/http://www.sdrm.org/roster/diesel/alco/index.html| archivedate= 13 January 2006 | url-status= live}}<br /> * {{cite book|author=Kirkland, John F.|title=The Diesel Builders, Volume Two: American Locomotive Company and Montreal Locomotive Works|publisher=Interurban Press, Glendale, CA|year=1989|isbn=0-916374-81-5}}<br /> * {{cite book|author=Pinkepank, Jerry A.|title=The Second Diesel Spotter&#039;s Guide|publisher=Kalmbach Publishing Co., Milwaukee, WI|year=1973|isbn=0-89024-026-4}}<br /> * {{cite book|author=Strapac, Joseph A.|title=Southern Pacific Historic Diesels, Volume 2: Diesel-Hydraulic Locomotives|publisher=Shade Tree Books, Bellflower, CA|year=1993|isbn=0-930742-15-X}}<br /> * {{cite book|author=Strapac, Joseph A.|title=Southern Pacific Historic Diesels, Volume 8: Alco Roadswitcher Locomotives|publisher=Shade Tree Books, Bellflower, CA|year=2001|isbn=0-930742-23-0}}<br /> <br /> ==External links==<br /> * [http://www.thedieselshop.us/Alco_Century6.HTML Alco Six-Axle Centuries Roster]<br /> * [http://espee.railfan.net/spdh-643.html Southern Pacific DH-643]<br /> <br /> {{ALCO diesels}}<br /> {{Authority control}}<br /> <br /> [[Category:ALCO locomotives|C-643DH]]<br /> [[Category:Diesel–hydraulic locomotives of the United States]]<br /> [[Category:C-C locomotives]]<br /> [[Category:Southern Pacific Railroad locomotives]]<br /> [[Category:Experimental locomotives]]<br /> [[Category:Railway locomotives introduced in 1964]]<br /> [[Category:Standard-gauge locomotives of the United States]]<br /> [[Category:Scrapped locomotives]]<br /> <br /> {{Diesel-loco-stub}}</div> imported>MichaelMaggs