Help:Surveyor Spline Straighten
From TrainzOnline
Straighten Spline
Click on Straighten Spline (B) and then Click LMB on a bent section of laid spline. The section of spline will straighten between the two spline points, the next spline segment will also affected (Some types of splines, such as 'double track' and 'tunnel' splines cannot be straightened).
Click again on the straightened spline and it will return to a curved spline.
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