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Use a resistor. To figure out the resistance you need use Ohms law (Everyone need to know this if they do any electronic work). V = I*R Also written as - R = V / I R is resistance. V is voltage drop needed. You can calculate this by taking the track voltage minus the voltage rating on the LED. For example, if your track voltage is 14 volts, and you LED is rated for 2 volts, you need a voltage drop of 12 volts. I is current. Don't ask me why they use I, although there is probably a reason. This is the current rating on you LED. If your LED is rated in milliamps, divide the rating by 1000 to get the value in amps. (Do the same if the voltage is in millivolts.)
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