First, are the bearings brass or stainless. If they're stainless, good. If not you've got the wrong car.
The mold for the new, old style traveler car is a bit different than the stock. The bearings holes were drilled just a touch higher, which makes the car drag on the bottom of the track.
Here's how I fix the problem.
Get a piece of 120 grit sand paper and place the whole sheet on something flat. Sand the bottom of the car making sure to keep it as flat as possible. Sand a little at a time until the car runs freely in the track. Don't take off too much material as it will weaken the car.
Hope that helps.
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