Do you set a negative value for the linear in the branch geometry ? I don't think it is allowed, that is why you get the message. What is the aim to set a negative value ? If I verify without any geometry for the branch, then rail track puts a radius R423.711786 L35.227694 and a straight L7.419. Not so different than what you want to set. The following is successfully verified. I set 1.509 as theoretical .1 to .1 length
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