feat(rails): the wing rails of the frogs of the low section of the blades, as Zu1-60, where the timbers have slide chairs: from 1.5 m before the throat to their ends the foot raised as much as the blades ride, the web shortened, the heads level with the rails beside, forged down to the plain rail along 0.5 m; a wing rail which is the stock rail of a blade too, as in the slips with the blades outside of the diamond, whole along its chairs; the fastening holding only rails raised as much moved up on a pad as wide as it, a raised rail on a fastening with others on a pad of its own

world/SleeperFastenings.h

@@ -15,6 +15,7 @@ http://mozilla.org/MPL/2.0/.
 
 #include <glm/glm.hpp>
 
+#include "world/Knots.h"
 #include "world/TrackSleepers.h"
 
 // the fastenings of the rails on the timbers: where a rail lies on a timber, the part of the model of the timbers which holds it
@@ -32,6 +33,9 @@ struct fastening {
     float shift { 0.f }; // along its x, how far the pivot is moved
     bool both { false }; // the fastening of two rails close beside each other, neither with a check rail of its own seated
     bool whole { false }; // holding more rails than its seats, out to its ends: not narrowed
+    float lift { 0.f }; // how far up it's moved, under a rail of the low section raised as a blade
+    float height { 1.f }; // along its y, from the bottom of the part: a pad stretched to fill under a raised rail
+    bool pad { false }; // under a raised rail or its fastening, not holding a rail itself
     // where an x of the part lands along its across, at the scale
     double placed( double const X, double const Scale ) const {
         return pivot + shift + Scale * ( X - pivot ); }
@@ -60,6 +64,7 @@ private:
         TTrack *track { nullptr };
         int path { 0 };
         int side { 1 };
+        knots::line rises; // of its foot, along the path, a wing rail of the low section raised as the blades
         std::vector<glm::dvec2> points;
         std::vector<double> heights;
         std::vector<glm::dvec2> inward; // unit vectors in plan from the rail toward the middle of its path
@@ -79,6 +84,7 @@ private:
         role kind { role::plain };
         glm::dvec2 inward { 1.0, 0.0 };
         double foot { 0.0 };
+        double rise { 0.0 };
     };
 
     // the rails lying on the timber, in the order along it, one where several lie on one another, but the blades
@@ -86,6 +92,9 @@ private:
     // the fastenings of rails close by fitted to the room between them: narrowed across, a plate cut short at the fastening of the
     // rail beside it or left out, the plates of two rails lying over each other made one
     static void fit( std::vector<fastening> &Fastenings, beam const &Beam, beam_model const &Model );
+    // the fastenings under the raised rails: one holding only rails raised as much moved up as far on a pad, a rail raised
+    // over a fastening with others on a pad of its own on it
+    static void lift( std::vector<fastening> &Fastenings, std::vector<hit> const &Rails, beam const &Beam, beam_model const &Model );
 
     std::vector<rail> m_rails;
 };