1 files changed, 1 insertions, 1 deletions
diff --git a/vehicle.h b/vehicle.h
index 4460a890f..a68a234bd 100644
--- a/vehicle.h
+++ b/vehicle.h
@@ -435,7 +435,7 @@ static inline Vehicle *GetFirstVehicleFromSharedList(Vehicle *v)
 }
 
 /* Validate functions for rail building */
-static inline bool ValParamRailtype(uint32 rail) { return rail <= GetPlayer(_current_player)->max_railtype;}
+static inline bool ValParamRailtype(uint32 rail) { return HASBIT(GetPlayer(_current_player)->avail_railtypes, rail);}
 
 // NOSAVE: Can be regenerated by inspecting the vehicles.
 VARDEF VehicleID _vehicle_position_hash[0x1000];