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Model Information: The model was introduced in 1990 and the early releases were made by Kato Japan for Atlas. From 2004 on, the models were made in China and the internals were modified to a more modern mechanism. The Atlas SD7, SD9, SD24 and SD26 all share the same internal mechanism and differ only in their shell details. The modern releases fall under the "Classic" label for the SD7 and SD9 models and "Master" label for the SD24 and SD 26.
The early releases featured the Kato-designed "low friction drive" which had been successfully introduced in their Kato-branded U30C model). This design allowed clean transfer of current from wheels to long copper strips to the chassis and then to the lightboard. This may not sound innovative, as many modern mechanisms use this design today, but in 1990 it was a game-changer. The post-2004 releases are fairly standard "modern" mechanisms featuring a split-frame, dual-flywheels, and magnetic operating knuckle couplers. They run quiet and smooth and can pull 30 or more standard-weight cars.
The early releases featured the Kato-designed "low friction drive" which had been successfully introduced in their Kato-branded U30C model). This design allowed clean transfer of current from wheels to long copper strips to the chassis and then to the lightboard. This may not sound innovative, as many modern mechanisms use this design today, but in 1990 it was a game-changer. The post-2004 releases are fairly standard "modern" mechanisms featuring a split-frame, dual-flywheels, and magnetic operating knuckle couplers. They run quiet and smooth and can pull 30 or more standard-weight cars.
DCC Information: Models produced from 2006 are DCC Ready or Dual-Model Decoder Equipped. They accept the following drop-in decoders:
- Digitrax DN163A0: 1 Amp N Scale Mobile Decoder for Atlas N-Scale GP40-2, U25B, SD35, Trainmaster, B23-7 and others
- TCS AMD4 (Installation for Atlas SD-9)
- NCE N12A0: Plug and play decoder for N-Scale Atlas GP40-2, U25B, U23B, B23-7, 30-7, 36-7, GP38, SD25, TRAINMASTER, etc.
- MRC 1812: N-Scale Sound Decoder for most Atlas short/medium locos (selection of 4 prime movers - might not be prototypical for this model however)
Earlier DCC factory-equipped versions were fitted with Lenz LE063XF decoders, whereas most recent versions are fitted with NCE N12A0 decoders. The Atlas version of these decoders will respond to manufacturer's address "127" (CV8) i.e. "Atlas Model Railroad Products", though being identical to their original manufacturer's specification.
- Digitrax DN163A0: 1 Amp N Scale Mobile Decoder for Atlas N-Scale GP40-2, U25B, SD35, Trainmaster, B23-7 and others
- TCS AMD4 (Installation for Atlas SD-9)
- NCE N12A0: Plug and play decoder for N-Scale Atlas GP40-2, U25B, U23B, B23-7, 30-7, 36-7, GP38, SD25, TRAINMASTER, etc.
- MRC 1812: N-Scale Sound Decoder for most Atlas short/medium locos (selection of 4 prime movers - might not be prototypical for this model however)
Earlier DCC factory-equipped versions were fitted with Lenz LE063XF decoders, whereas most recent versions are fitted with NCE N12A0 decoders. The Atlas version of these decoders will respond to manufacturer's address "127" (CV8) i.e. "Atlas Model Railroad Products", though being identical to their original manufacturer's specification.
Prototype History: 
An SD9 is a 6-axle diesel locomotive built by General Motors Electro-Motive Division between January 1954 and June 1959. An EMD 567C 16-cylinder engine generated 1,750 horsepower (1.30 MW). This model is, externally, similar to its predecessor, the SD7, but this model, internally, features the improved and much more maintainable 567C engine. The principal spotting feature are the classification lights on the ends of the locomotive, above the number board. The SD9's classification lights are on a small pod, canted outward. The last phase of construction had a carbody similar to the SD18 and SD24, and used two 48-inch (1,219 mm) cooling fans instead of four 36-inch (914 mm) cooling fans.
Four hundred and seventy-one SD9s were built for American railroads and 44 for export.
Read more on Wikipedia.
Full EMD SD9 data sheet on The Diesel Workshop.
Four hundred and seventy-one SD9s were built for American railroads and 44 for export.
Read more on Wikipedia.
Full EMD SD9 data sheet on The Diesel Workshop.
Road Name History: 
The Norfolk and Western Railway (reporting mark NW), was a US class I railroad, formed by more than 200 railroad mergers between 1838 and 1982. It was headquartered in Roanoke, Virginia, for most of its 150-year existence. Its motto was "Precision Transportation"; it had a variety of nicknames, including "King Coal" and "British Railway of America" even though the N&W had mostly articulated steam on its roster. During the Civil War, the N&W was the biggest railroad in the south and moved most of the products with their steam locomotives to help the South the best way they could.
NW was famous for manufacturing its own steam locomotives, which were produced at the Roanoke Shops, as well as its own hopper cars. Around 1960, NW became the last major American railroad to convert from steam locomotives to diesel motive power but didn't retire its last remaining Y class locomotives until 1964 and 1965. By 1965, steam on class I railroads was gone but steam wasn't gone on class II railroads until 1974 and class III and mining railroads retired their steam locomotives from their active roster until 1983. By 1983, steam in America on class I, II, III, and mining railroads had finally closed the chapter on America's 150 years of steam from 1830 - 1983.
In December 1959, NW merged with the Virginian Railway (reporting mark VGN), a longtime rival in the Pocahontas coal region. By 1970, other mergers with the Nickel Plate Road and Wabash formed a system that operated 7,595 miles (12,223 km) of road on 14,881 miles (23,949 km) of track from North Carolina to New York and from Virginia to Iowa.
In 1980, NW teamed up with the Southern Railway, another profitable carrier and created the Norfolk Southern Corporation holding company by merging its business operations with the business operations of the Southern Railway. The NW and the Southern Railway continued as separate railroads now under one holding company.
On December 31, 1990, the Southern Railway was renamed "Norfolk Southern Railway" to reflect the Norfolk Southern Corporation and on the same day, the renamed Norfolk Southern Railway gained full control of the Norfolk and Western Railway with the Norfolk and Western being transferred from the holding company to the renamed Norfolk Southern Railway, this began the final years of Norfolk and Western which was absorbed into the renamed Norfolk Southern Railway seven years later in 1997 (1990 to 1997 the Norfolk and Western continued operating by using paper operations).
In 1997 during the Conrail battle with CSX, Norfolk Southern Corporation's principal railroad, the renamed Norfolk Southern Railway, absorbed the Norfolk and Western Railway into their rail system, ending the existence of the Norfolk and Western Railway and having the renamed Norfolk Southern Railway becoming the only railroad in the entire Norfolk Southern system after that.
NW was famous for manufacturing its own steam locomotives, which were produced at the Roanoke Shops, as well as its own hopper cars. Around 1960, NW became the last major American railroad to convert from steam locomotives to diesel motive power but didn't retire its last remaining Y class locomotives until 1964 and 1965. By 1965, steam on class I railroads was gone but steam wasn't gone on class II railroads until 1974 and class III and mining railroads retired their steam locomotives from their active roster until 1983. By 1983, steam in America on class I, II, III, and mining railroads had finally closed the chapter on America's 150 years of steam from 1830 - 1983.
In December 1959, NW merged with the Virginian Railway (reporting mark VGN), a longtime rival in the Pocahontas coal region. By 1970, other mergers with the Nickel Plate Road and Wabash formed a system that operated 7,595 miles (12,223 km) of road on 14,881 miles (23,949 km) of track from North Carolina to New York and from Virginia to Iowa.
In 1980, NW teamed up with the Southern Railway, another profitable carrier and created the Norfolk Southern Corporation holding company by merging its business operations with the business operations of the Southern Railway. The NW and the Southern Railway continued as separate railroads now under one holding company.
On December 31, 1990, the Southern Railway was renamed "Norfolk Southern Railway" to reflect the Norfolk Southern Corporation and on the same day, the renamed Norfolk Southern Railway gained full control of the Norfolk and Western Railway with the Norfolk and Western being transferred from the holding company to the renamed Norfolk Southern Railway, this began the final years of Norfolk and Western which was absorbed into the renamed Norfolk Southern Railway seven years later in 1997 (1990 to 1997 the Norfolk and Western continued operating by using paper operations).
In 1997 during the Conrail battle with CSX, Norfolk Southern Corporation's principal railroad, the renamed Norfolk Southern Railway, absorbed the Norfolk and Western Railway into their rail system, ending the existence of the Norfolk and Western Railway and having the renamed Norfolk Southern Railway becoming the only railroad in the entire Norfolk Southern system after that.
Brand/Importer Information: 
In 1924 Stephan Schaffan, Sr. founded the Atlas Tool Company in Newark, New Jersey. In 1933 his son, Stephan Schaffan, Jr., came to work for his father at the age of sixteen. Steve Jr. built model airplanes as a hobby and frequented a local hobby shop. Being an enterprising young man, he would often ask the owner if there was anything he could do to earn some extra spending money. Tired of listening to his requests, the hobby-store owner threw some model railroad track parts his way and said, "Here, see if you can improve on this".
In those days, railroad modelers had to assemble and build everything from scratch. Steve Jr. created a "switch kit" which sold so well, that the entire family worked on them in the basement at night, while doing business as usual in the machine shop during the day.
Subsequently, Steve Jr. engineered the stapling of rail to fiber track, along with inventing the first practical rail joiner and pre-assembled turnouts and flexible track. All of these products, and more, helped to popularize model railroading and assisted in the creation of a mass-market hobby. The budding entrepreneur quickly outgrew the limitations of a basement and small garage operation. Realizing they could actually make a living selling track and related products, Steve and his father had the first factory built in Hillside, New Jersey at 413 Florence Avenue in 1947. On September 30, 1949, the Atlas Tool Company was officially incorporated as a New Jersey company.
In 1985, Steve was honored posthumously for his inventions by the Model Railroad Industry Association and was inducted into the Model Railroad Industry Hall of Fame in Baltimore, Maryland. In addition, Steve was nominated and entered into the National Model Railroad Association Pioneers of Model Railroading in 1995.
In the early 1990s, the Atlas Tool Company changed its name to Atlas Model Railroad Company, Inc.
In those days, railroad modelers had to assemble and build everything from scratch. Steve Jr. created a "switch kit" which sold so well, that the entire family worked on them in the basement at night, while doing business as usual in the machine shop during the day.
Subsequently, Steve Jr. engineered the stapling of rail to fiber track, along with inventing the first practical rail joiner and pre-assembled turnouts and flexible track. All of these products, and more, helped to popularize model railroading and assisted in the creation of a mass-market hobby. The budding entrepreneur quickly outgrew the limitations of a basement and small garage operation. Realizing they could actually make a living selling track and related products, Steve and his father had the first factory built in Hillside, New Jersey at 413 Florence Avenue in 1947. On September 30, 1949, the Atlas Tool Company was officially incorporated as a New Jersey company.
In 1985, Steve was honored posthumously for his inventions by the Model Railroad Industry Association and was inducted into the Model Railroad Industry Hall of Fame in Baltimore, Maryland. In addition, Steve was nominated and entered into the National Model Railroad Association Pioneers of Model Railroading in 1995.
In the early 1990s, the Atlas Tool Company changed its name to Atlas Model Railroad Company, Inc.
Item created by: Alain LM on 2017-01-01 08:28:20. Last edited by Alain LM on 2017-01-01 07:33:22
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