I have both on my layout. I have one long Fastrack line and 3 Realtrax lines. Lionel is much easier to assemble. However; it is LOUD compared to the Realtrax system. I sometimes find the noise irritating and shutdown my outside line. With that said, it's also a conventional line and the Realtrax lines are DCS. It could be that the speed control of the DCS system makes me think it's much quieter than the Fastrack system.
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