The two fields are wound in opposite directions. If you connect both at the same time, the motor will not turn at all. If you want more power out of the motor, increase the current in the armature by shunting the field with a resistor. But if the problem is adhesion, only three things will help: increase the coefficient of friction, increase the weight, increase the pull of the magnatraction. The other option is reduce the train resistance by cleaning the wheels and lubricating the bearings on the cars being pulled.
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