Weird Surface after Sweep2

Rhino
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1

ViewCapture20231218_122919
ViewCapture20231218_1229197434×4130 278 KB

I tried to sweep2 these 5 curves starting with red curves as the first and second rail.
I can remove middle blue one but it has to remain with others.

HELP!
Question_231218.3dm (2.3 MB)

2

try _NetworkSrf

image
image1883×882 62 KB

3

omg, it is much cleaner! Thank you

4

image
If this is better, please click on Solution
thanks.