Laying out curves on a model railroad can be a bit tricky. It's easy to kink the track and make un-even curves. There are also a few rules about opposing curves and changing radi.
While commercial track systems are easy to use, it can be difficult to figure out how to use these modules without causing kinks in the track at the joints. Care must be taken to ensure the puzzle of track modules fits the track design you designed.
Using flex track or hand-laying gives more design possibilities, but care must be taken to keep the curves even and kink-free.
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