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Harvey

Outside layouts can have small twigs and pebbles that can cause derailments.

Sailbode

But back to the main questions, you need to check the gauge of the wheels on the cars that keep derailing. If only certain cars derail, check the distance between the flanges, side to side, compared to the cars that never derail. Also, check the couplers for binding when traversing curves. Another thing to check is the track joiners. If you are using Aristo Craft track and joiners, note that one side of the joiner is higher than the other side. This higher side should always be on the outer side of the rail or else the wheel flange can hit the jointer and cause a derailment.

Randy
 
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