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In depth idiot
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The electromagnet eliminates the 'surge' as steel axled vehicles approach a permanent magnet. This can be a real problem with free running stock, if the kadee on the rear of the vehicle ahead is still over the permanent magnet, when the next vehicle's leading axle is tugged forward - and there's an uncouple you weren't looking for! - typically between vehicles near the rear of the train.

So my preference is the electromagnet. I actuate the electromagnets using a probe on a wire against a vertical contact on the layout edge. No way will that lead to a burn out.
 
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