Here is a list of all topics with brief descriptions:

Streaming functions	Functions to stream data in and out
Curve Comparison	Comparison functions for curves. Two curves of different types are considered not equal
Curve Creation	Curve creation by points to connect (Boundary Value Problem). The methods try to create the simplest curve that will comply with the given parameters. If a tangent is missing for either the start or end position, this means that there is no restriction on it; the method will deliver the simplest curve with any tangent. If a tangent is supplied by a VectorBundle, it should carry a reasonable cubic overshoot as its length, in case a Cubic can get produced. The Arc will always be coplanar to the up - direction; the Helix always upright with respect to up. The error margins control what deviation in the start and end positions and tangents is acceptable. The resulting curve is guaranteed to deliver values that deviate no more than these from the parameters used for creation
RailRunner's End Helpers	Helper functions to get the front and back ends of an oriented element
Track's Segments	Gets a segement length ds, so that the visible failure in a track would become smaller than some marginal distance of e
Track's Foot Point	Foot of a point in space on a track. Finds a point on a track so that the line from it to the target point stands perpendicular on the track's tangent at that point
Track's Closest Point	Finds a closest point on a track. If there are more than three foot points on the track to the point in question, the point found might not be the globally closest point on the track, but might be one locally closest