diff --git a/extern/rail_diagram b/extern/rail_diagram
index dd5ed09..6c99102 160000
--- a/extern/rail_diagram
+++ b/extern/rail_diagram
@@ -1 +1 @@
-Subproject commit dd5ed091f91ab789bc829cd9754da6d830e4c038
+Subproject commit 6c99102d3952a2fde41b3d41a004779ebf8253a9