This subject comes up about once a year. I don't think one person's experiences from their own layout fits all circumstances. Proper springing makes a noticeable difference on my layout where six number 6 turnouts run tightly one after another. These include ROW cast frogs. My non-sprung MTH J clunks through the string of switches while the nicely sprung Overland J model glides through more smoothly. Regarding better pulling power or traction, I don't really know or care one way or the other. I still like the MTH models and run them regularly. Other engines that have springs that a are too stiff exhibit similar behavior as non-sprung. Good luck. It might be worth a try.
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