Help:Surveyor Objects Advanced Spline Height
From TrainzOnline
Spline Height
Select the Spline Height (H) tool and then LMBH and drag on a spline point to raise or lower that point. The adjacent sections of the spline will be adjusted to the new height according to the properties of the spline. The rotating circle marking the spline point will be changed from white to yellow, indicating that the height is now absolute, not relative to the local ground level. Note that the spline point height will become an absolute height even if the height doesn't actually change.
The height of the spline point will be displayed as it is adjusted. Press and hold the Ctrl key to adjust the height in smaller increments.
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