The reason that postwar transformers start at 6 volts is because the e-unit operates at start up. If a loco starts nice and slow from zero volts, as soon as the voltage gets high enough to operate the e-unit, it goes into neutral. The post war equipment and transformers are designed for the e-unit to operate as soon as the voltage hits the loco and then the loco starts to move. If you want your locos to start nice and slow you have to either turn the postwar e-unit off or change to an electronic e-unit.
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