Index: src/rail_gui.cpp
===================================================================
--- src/rail_gui.cpp	(revision 27546)
+++ src/rail_gui.cpp	(working copy)
@@ -710,7 +710,7 @@
 					break;
 
 				case DDSP_CONVERT_RAIL:
-					DoCommandP(end_tile, start_tile, _cur_railtype | (_ctrl_pressed ? 0x10 : 0), CMD_CONVERT_RAIL | CMD_MSG(STR_ERROR_CAN_T_CONVERT_RAIL), CcPlaySound10);
+					DoCommandP(end_tile, start_tile, _cur_railtype | (_ctrl_pressed ? 0x10 : 0), CMD_CONVERT_RAIL | CMD_MSG(STR_ERROR_CAN_T_CONVERT_RAIL), CcPlaySound1E);
 					break;
 
 				case DDSP_REMOVE_STATION: