diff --git a/src/tunnelbridge_cmd.cpp b/src/tunnelbridge_cmd.cpp
--- a/src/tunnelbridge_cmd.cpp
+++ b/src/tunnelbridge_cmd.cpp
@@ -305,9 +305,10 @@ CommandCost CmdBuildBridge(TileIndex end
 			return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
 		}
 
-		/* Do not replace town bridges with lower speed bridges. */
+		/* Do not replace town bridges with lower speed bridges, unless in scenario editor. */
 		if (!(flags & DC_QUERY_COST) && IsTileOwner(tile_start, OWNER_TOWN) &&
-				GetBridgeSpec(bridge_type)->speed < GetBridgeSpec(GetBridgeType(tile_start))->speed) {
+				GetBridgeSpec(bridge_type)->speed < GetBridgeSpec(GetBridgeType(tile_start))->speed &&
+				_game_mode != GM_EDITOR) {
 			Town *t = ClosestTownFromTile(tile_start, UINT_MAX);
 
 			if (t == NULL) {