fix(sleepers): the wing rails on the timbers as they're bent out: the rails of a track taken in their parts between the cuts at the crossings, as they're laid, a part going on over the gap at an obtuse crossing where its check rail lies; three rails or more close beside held by the fastening of two rails covering the most of them first, then those before and after it, one holding more rails than its seats not narrowed; a rail lying on the brace of a chair beside takes the brace away; a plate cut short at the fastening beside from where its narrowing left it

world/SleeperRules.h

@@ -57,6 +57,8 @@ double constexpr fastening_merge { 0.03 };
 // one, as the legs of the nose where they're joined, in one plate between them
 double constexpr fastening_pair { 0.2 };
 double constexpr fastening_nose { 0.05 };
+// three rails or more with less than this between each and the next, as the legs of a nose with the wing rails beside, are held together
+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 };
 // the room left between the fastenings of rails close by, and how narrow their plates get to keep it