0-42 curves and switches. I've always used 0-42 because they seem to work best with my room sizes (medium) and most everything I buy that's 0-42 fits the limit of what I am willing to pay for a new engine ($750 max; average, $350-$550). I admit, some of my engines (i.e. MTH Premier E8's) hang over quite a bit on curves, but it's the limitation I've accepted. My new train room is much longer than wide so it isn't a problem. I can see why 0-72 is the most popular here because that is the sweet spot for a quality layout if you have the space.
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