The Magnetic Damping Accessory can be used with either a Dynamics Cart or a
PAScar. The steel bracket of the Accessory is attracted to the magnets built
into the cart, and the bracket easily slides up and down to adjust the amount of
damping. The magnetic drag is caused by the induced currents in the aluminum
track, and is approximately proportional to the speed of the cart. This
accessory will not work with plastic tracks!