You can set the start voltage by using CV02. The higher the start voltage, the higher the locomotive's initial speed when started. This adjustment is used to trim the locomotive to compensate for its motor efficiency. If you have a locomotive that takes a lot of voltage to get started, this adjustment can be helpful.

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Discrete Speed Steps
Start Voltage
Mid Point Voltage, Max Voltage
Loadable Speed Tables

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Back EMF
Acceleration and Deceleration Rates
The Throttle Response Curve, Adjusting

Adapted from "Digital Command Control: The Wave of the Future", by Zana and A.J. Ireland.