Sweep not working

My sweep doesn’t work and I don’t know the reason.

sweep_problem.gh (5.1 KB)

First, make sure your rail curves direction is correct.

It seems that Sweep1 needs one rail curve for every section curve, so you could match the rail curves with ‘Duplicate Data’
sweep_problem_XY.gh (4.5 KB)

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Thank you @xy236!

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