“EMD SD7”的意思、由来-开放百科全书

词条

EMD SD7

释义

Original buyers
Preservation
References

{{More footnotes|date= June 2008}}{{Infobox Locomotive
| name=EMD SD7
| powertype=Diesel-electric
| image=SP 1518 20050716 Illinois Railway Museum.JPG
| caption=SP 1518 at the Illinois Railway Museum
| builder=General Motors Electro-Motive Division (EMD)
| buildmodel=SD7
| builddate=May 1951 – November 1953
| totalproduction=188
| aarwheels=C-C
| gauge={{track gauge|ussg|allk=on}}
| trucks = EMD Flexicoil C
| wheeldiameter = {{convert|40|in|mm|0|abbr=on}}
| minimumcurve = 23° ({{convert|250|ft|m|2|abbr=on}} radius)
| wheelbase = {{convert|48|ft|7|in|m|2|abbr=on}}
| length = {{convert|61|ft|2+3/4|in|m|2|abbr=on}}
| width = {{convert|10|ft|8|in|m|2|abbr=on}}
| height = {{convert|15|ft|4+1/2|in|m|2|abbr=on}}
| locoweight = {{convert|309000|lb|abbr=on}}
| fuelcap = {{convert|1200|usgal|L impgal|abbr=on}}
| primemover=EMD 567B
| rpmrange = 800
| enginetype =V16 diesel engine
| aspiration = Roots-type supercharger
| displacement = {{convert|9072|cuin|L|abbr=on}}
| generator = D-12-C
| tractionmotors = (6) D-27-B
| headendpower =
| cylindercount=16
| poweroutput={{convert|1500|hp|MW|2|abbr=on}}
| tractiveeffort = {{convert|77250|lbf|abbr=on}}
| locale=United States
| disposition=some still in service
}}

An SD7 is a 6-axle road switcher diesel-electric locomotive built by General Motors Electro-Motive Division between May 1951 and November 1953. It had an EMD 567B 16-cylinder engine producing {{convert|1500|hp|MW|2}} for its six traction motors. 188 were built for United States railroads.^[1] Starting in August 1953 a total of 26 SD7s were produced which used either the 567BC engine or the 567C engine. These units are noted on the roster below.

This was the first model in EMD's SD (Special Duty) series of locomotives, a lengthened B-B GP7 with a C-C truck arrangement. The two extra axles and traction motors are useful in heavy, low speed freight service. SD series locomotives are still being produced today, with the SD70 being the most popular example in current production,^[2] and with many SD40-2s and rebuilds to SD40-2 specifications, or SD60s still in operation.

Yesterday's Special Duty eventually became today's Standard Duty, and yesterday's General Purpose has become today's Special Purpose ("time" freight and other time-sensitive lading). True GPs were discontinued after the completion of the last GP60 in 1994. Recently intermodal and other fast freights may be hauled by 6 axles locomotives with 4 powered axles, such as the SD70ACe-P4.

Many earlier model GPs, most particularly GP40s, GP39s and GP38s, also their SD equivalents, SD40s, SD39s and SD38s have been rebuilt to Dash 2 standards for another 30 to 40 years of service.

Original buyers

Owner	Quantity	Numbers	Notes
Electro-Motive Division	2	990	to Southern Pacific 5308 then 2715 to 1415 ne 1518
Electro-Motive Division	2	991	to Baltimore and Ohio 760
Baltimore and Ohio Railroad	4	761–764	These units were built with the 567BC engine.
Bessemer and Lake Erie Railroad	8	451–455, 801–803
Chicago and North Western Railway	5	1660–1664
Chicago, Burlington and Quincy Railroad	37	300–324, 400–411	322-324 were built with the 567BC engine. To Burlington Northern 6023-6059
Chicago, Milwaukee, St. Paul and Pacific Railroad	24	2200–2223	Renumbered 500–523, 2215-2223 were built with the 567BC engine.
Colorado and Southern Railway	10	810–819	To Burlington Northern Same numbers
Central of Georgia Railway	1	201
Denver and Rio Grande Western Railroad	5	5300–5304
Fort Worth and Denver Railway	11	850–860	858-860 were built with the 567BC engine. To Burlington Northern Same numbers.
Great Northern Railway	23	550–572	To Burlington Northern 6000-6022
Kennecott Copper Corporation	1	903
Minneapolis and St. Louis Railway	2	852, 952	Renumbered 300–301. To Chicago and North Western Railway.
Nevada Northern Railway	1	401
Pennsylvania Railroad	2	8588–8589	These units were built with the 567BC engine
Southern Pacific Company	42	5279–5293, 5309–5335	5321-5323, 5334-5335 were built with the 567C engine
Union Pacific Railroad	10	775–784
Total	188

Preservation

The first SD7 (later converted into an SD7R) built by EMD, former demonstrator #990, Southern Pacific 1518, is preserved in operational condition at the Illinois Railway Museum.
Central of Georgia 201 is preserved at the Virginia Museum of Transportation.
The Dakota Southern Railway rosters two SD7's, #512, and #522 (Ex-WSOR #522, Exx-MILW #522, Exxx-MILW #2222).
Great Northern No. 558, one of the first 20 SD7s to be built in 1952, is preserved and in restoration at the Minnesota Transportation Museum.

References

1. ^{{cite book|last=Pinkpank|first=Jerry A|title=The Second Diesel Spotter’s Guide|year=1973|publisher=Kalmbach Books|lccn=66-22894|isbn=|pages=71}}
2. ^{{cite book|editor-first=David|editor-last=Ross|title=The Encyclopedia of Trains and Locomotives|year=2003|publisher=|lccn=|isbn=978-0-7607-9679-5|pages=281, 364, 368–369}}

{{Dorin-North Western|page=114}}
{{cite book|last=Pinkpank|first=Jerry A|title=The Second Diesel Spotter’s Guide|year=1973|publisher=Kalmbach Books|lccn=66-22894|isbn=0-89024-026-4|pages=17, 26, 71–72}}
Sarberenyi, Robert. EMD SD7 Original Owners. Retrieved on August 27, 2006
Diesel Era Volume 6 Number 6 November/December 1995, "EMD's SD7" by Paul K. Withers pp 5-20; 47-50.
EMD Product Reference Data Card dated January 1, 1959 has the 567BC and 567C engine data used in the as-built roster.

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