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For a given voltage, the SD-45 is slower than the SD-40. I haven't compared the current draw of the motors and light current is on no consequence to me since I convert everything to LEDs. I run everything on battery power.
 

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I am not talking about the limitations of internal electronics. My comparison is based on how fast the locomotive runs with 14.4 volts applied. The SD-45 is quite a bit slower. I have not compared the individual speed curves.
 
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