diff --git a/src/rail.cpp b/src/rail.cpp
--- a/src/rail.cpp
+++ b/src/rail.cpp
@@ -13,6 +13,7 @@
 #include "date_func.h"
 #include "player_func.h"
 #include "player_base.h"
+#include "engine_func.h"
 
 
 /* XXX: Below 3 tables store duplicate data. Maybe remove some? */