fix(sleepers): the fastening of the rails of a frog, holding more of them than its seats, stretched under them all as the plate of the frog, its ends with the clips past the feet of the wing rails, short of the feet of the rails beside, and not narrowed then; the wing rails no longer lying off its ends with no clip

world/SleeperRules.h

@@ -61,6 +61,8 @@ double constexpr fastening_nose { 0.05 };
 double constexpr fastening_crowd { 0.3 };
 // how far apart the rails lie in the fastening of both, the check part of the model
 double constexpr check_seats { 0.113 };
+// how far past the edge of the foot of a rail its fastening reaches, with the clip holding it
+double constexpr fastening_clip { 0.09 };
 // the room left between the fastenings of rails close by, and how narrow their plates get to keep it
 double constexpr fastening_gap { 0.01 };
 double constexpr plate_least { 0.6 };