What decoder do I need for an Atlas Master Line Locomotive - Silver Series EMD SD9 or EMD SD7 DC Silent Decoder Ready Locomotive?

Are the Atlas SD7/9 Decoder Ready if no one makes a Decoder that fits?

Atlas SD7 Decoder Ready for Model Trains enthusiasts
Atlas SD9 Decoder Ready for Model Trains enthusiasts
Atlas GE DASH 8-40B DC Silent DCC Ready tailored for Model Trains
Atlas GP7 PH.2 Decoder Ready for Model Trains
Atlas GP9 Decoder Ready for Model Trains
Atlas TRAIN MASTER Decoder Ready for Model Trains
Atlas FB-1 LOCOMOTIVE Decoder Ready
Atlas FA-1 LOCOMOTIVE Decoder Ready
Scaletrains Rivet Counter N Scale EMD SD40-2
Scaletrains Rivet Counter N Scale GE C39-8
Intermountain N Scale EMD F7A and F7B Locomotives

ESU 59925 LokPilot 5 Nano DCC With E24 interface, N Scale Model Trains Decoder
ESU 58925, LokSound 5 Nano DCC With E24 interface, N Scale Sound Model Trains Decoder

The Atlas Classic N Scale Model Trains SD-7 Locomotive is based on the prototype manufactured by EMD from February 1952 to November 1953. Utilizing a 1,500 hp engine and a longer underframe than the GP-7, the SD-7 was the first locomotive to use EMD's Flexicoil truck.

Built by EMD between 1954 and 1959, the SD-9 6-axle road switchers produced 1,750 HP and were used primarily for freight service throughout the US, both on main and secondary lines. Many SD-9 locomotives are still in service today, serving as road switchers for shortline & industrial railroads, and as yard switchers for major "Class 1" lines.

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