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 Cary Clark / FAQ / Trains / load

What are the electrical limits of 9V trains?

From Simon Robinson: !

The controller supplies a variable voltage. As you move the speed regulater from zero to the first of the 6 marks the voltage jumps up to about 3V. It then increases linearly up to about 9V for the maximum speed.

The motor power unit has a resistance of 8.7 ohms, so at maximum speed, it’s using about an amp, which works out to 9 watts of power.

For a typical controller, expect:


Full Power
Minimum Speed
   Open Circuit
9.24V
2.99V
   With Train Running
9.04V
2.99V
   Internal Resistance
0.09 ohms
0.02 ohms
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