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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 used 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 body-mounted 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 used 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 body-mounted 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 SD7 is a 6-axle road switcher diesel-electric locomotive built by General Motors Electro-Motive Division between February 1952 and November 1953. It had an EMD 567B 16-cylinder engine producing 1,500 horsepower (1.12 MW) for its six traction motors. 188 were built for United States railroads. 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, 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.
From Wikipedia
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, 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.
From Wikipedia
Road Name History: 
First of all, Milwaukee Road has only ever been a popular nickname. The real name from 1874 was Chicago Milwaukee & St. Paul. For the next 36 years, the CM&StP linked Chicago with Milwaukee, Green Bay, Madison, Wausau, the Twin Cities, Duluth, Kansas City and Omaha with a dense network of branches in Wisconsin, Iowa, southern Minnesota and eastern South Dakota. Essentially, the lines ended at the Missouri River.
With a dearth of friendly western connections, CM&StP decided to build their own line to the Pacific. The original target was the bustling megalopolis of Eureka, California. However, they built toward Seattle instead. In 1909 the line opened. Along the way, they served Miles City, Lewiston, Great Falls, Harlowton and Butte, Montana; Avery, Idaho; and Spokane, Seattle and Tacoma, Washington. In 1912, they began to electrify two long segments, Harlowton, Montana to Avery, Idaho and Othello, Washington to Tacoma.
In 1921, they leased the Chicago Terre Haute & Southeastern and a bit later the Chicago Milwaukee & Gary to reach the coal fields of southern Indiana. Both roads were in trouble and dragged the CM&StP into receivership. In 1928, they emerged with a small name change. It was now the Chicago Milwaukee St. Paul & Pacific. Right after that, the nickname “Milwaukee Road” began to catch on.
The three Class One’s that already served the Pacific Northwest, Northern Pacific, Great Northern (along with their jointly owned minion Spokane Portland & Seattle) and Union Pacific were not pleased with their new neighbor and avoided building interchanges with them unless absolutely necessary. This left Milwaukee to haul whatever traffic they could originate or terminate on their own line or via a hand full of shortlines with which they interchanged. This is why when you see photos of Milwaukee Road trains west of the Dakotas, an exceptionally large majority of cars are lettered for Milwaukee Road.
Milwaukee’s steam fleet is generally quite handsome beginning with the period after WWI. Many locomotives were built in their own shops. The steam era came to an end on the Milwaukee in 1957.
The electrified lines were ruled by boxcabs and Bi-Polars for decades. In the 1950’s, Little Joe’s diverted from the Soviet Union arrived on the Milwaukee (and the South Shore.) By the late 60’s diesels began to regularly invade the electrified lines. Little Joes and diesels were MU’ed. The aging catenary could only handle so many electrics at a time so diesels filled the horsepower gap. By 1972, falling traffic, a declining fleet of serviceable electrics and the deteriorating catenary caused Milwaukee Road to de-energize the western lines lines with Avery to Harlowton lines following two years later.
Meanwhile on the east end, as a condition of the 1971 merger of Monon into L&N, Milwaukee Road received trackage rights from Chicago to Louisville. This gave Southern a friendly connection to Chicago it was losing with Monon.
In 1977, Milwaukee Road entered receivership again. This time, radical restructuring was needed. In 1980, everything west of Miles City, Montana was abandoned. Some lines were picked up by connections or spawned new shortlines but nearly 1,000 miles of track was pulled up. In 1982, Miles City to Ortonville, Minnesota was abandoned. Milwaukee was concentrating on their pre-1909 routes plus the new line to Louisville.
In an attempt to win back middle distance TOFC traffic, Milwaukee began running fast and short piggyback trains, usually behind a single SD40-2 and with a dozen or so 89’ flats. Unit coal trains added to the bottom line. By the mid-80s, the streamlined Milwaukee Road was up for sale and Grand Trunk Western, Chicago & North Western and Soo Line got into a bidding war. GTW had diverted 40,000 cars onto Milwaukee Road between Chicago and Duluth to help them turn a profit in 1983. Ironically, the ICC (which controlled mergers at the time) pushed GTW out of the contest leaving just C&NW and Soo. Furious, GTW diverted their 40,000 carloads off the Milwaukee. C&NW outbid Soo, but the ICC chose Soo Line anyway. Milwaukee Road merged into Soo Line in 1985. Almost immediately, Soo shops began painting big black rectangles over MILWAUKEE ROAD on the diesels, giving birth to the “bandit” paint scheme.
With a dearth of friendly western connections, CM&StP decided to build their own line to the Pacific. The original target was the bustling megalopolis of Eureka, California. However, they built toward Seattle instead. In 1909 the line opened. Along the way, they served Miles City, Lewiston, Great Falls, Harlowton and Butte, Montana; Avery, Idaho; and Spokane, Seattle and Tacoma, Washington. In 1912, they began to electrify two long segments, Harlowton, Montana to Avery, Idaho and Othello, Washington to Tacoma.
In 1921, they leased the Chicago Terre Haute & Southeastern and a bit later the Chicago Milwaukee & Gary to reach the coal fields of southern Indiana. Both roads were in trouble and dragged the CM&StP into receivership. In 1928, they emerged with a small name change. It was now the Chicago Milwaukee St. Paul & Pacific. Right after that, the nickname “Milwaukee Road” began to catch on.
The three Class One’s that already served the Pacific Northwest, Northern Pacific, Great Northern (along with their jointly owned minion Spokane Portland & Seattle) and Union Pacific were not pleased with their new neighbor and avoided building interchanges with them unless absolutely necessary. This left Milwaukee to haul whatever traffic they could originate or terminate on their own line or via a hand full of shortlines with which they interchanged. This is why when you see photos of Milwaukee Road trains west of the Dakotas, an exceptionally large majority of cars are lettered for Milwaukee Road.
Milwaukee’s steam fleet is generally quite handsome beginning with the period after WWI. Many locomotives were built in their own shops. The steam era came to an end on the Milwaukee in 1957.
The electrified lines were ruled by boxcabs and Bi-Polars for decades. In the 1950’s, Little Joe’s diverted from the Soviet Union arrived on the Milwaukee (and the South Shore.) By the late 60’s diesels began to regularly invade the electrified lines. Little Joes and diesels were MU’ed. The aging catenary could only handle so many electrics at a time so diesels filled the horsepower gap. By 1972, falling traffic, a declining fleet of serviceable electrics and the deteriorating catenary caused Milwaukee Road to de-energize the western lines lines with Avery to Harlowton lines following two years later.
Meanwhile on the east end, as a condition of the 1971 merger of Monon into L&N, Milwaukee Road received trackage rights from Chicago to Louisville. This gave Southern a friendly connection to Chicago it was losing with Monon.
In 1977, Milwaukee Road entered receivership again. This time, radical restructuring was needed. In 1980, everything west of Miles City, Montana was abandoned. Some lines were picked up by connections or spawned new shortlines but nearly 1,000 miles of track was pulled up. In 1982, Miles City to Ortonville, Minnesota was abandoned. Milwaukee was concentrating on their pre-1909 routes plus the new line to Louisville.
In an attempt to win back middle distance TOFC traffic, Milwaukee began running fast and short piggyback trains, usually behind a single SD40-2 and with a dozen or so 89’ flats. Unit coal trains added to the bottom line. By the mid-80s, the streamlined Milwaukee Road was up for sale and Grand Trunk Western, Chicago & North Western and Soo Line got into a bidding war. GTW had diverted 40,000 cars onto Milwaukee Road between Chicago and Duluth to help them turn a profit in 1983. Ironically, the ICC (which controlled mergers at the time) pushed GTW out of the contest leaving just C&NW and Soo. Furious, GTW diverted their 40,000 carloads off the Milwaukee. C&NW outbid Soo, but the ICC chose Soo Line anyway. Milwaukee Road merged into Soo Line in 1985. Almost immediately, Soo shops began painting big black rectangles over MILWAUKEE ROAD on the diesels, giving birth to the “bandit” paint scheme.
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: Steve German on 2016-04-17 18:04:08. Last edited by gdm on 2020-07-24 07:29:28
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