Roller Coaster
I made some test with different kind of tracks...

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Then I came across the "Rollercoaster factory" set.
Adam Reed Tucker, the creator of the LEGO Architecture Series,
along with engineers at CoasterDynamix have developed a realistic
roller coaster set that is compatible with LEGO bricks.
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The original rail connector pins (the brass ones) were a little too
thick (1.8 mm) for easy connections. I made new ones out of 1.7 mm wire.
The ends of the original pins were just cut, not rounded. The rounded
ends are necessary to make the building-up easy.
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More pictures of this trailer here .
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More pictures of this trailer here .
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More pictures of this trailer here .
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