diff --git a/src/lang/traditional_chinese.txt b/src/lang/traditional_chinese.txt
--- a/src/lang/traditional_chinese.txt
+++ b/src/lang/traditional_chinese.txt
@@ -2891,6 +2891,7 @@ STR_NEWGRF_INVALID_ENGINE                                       :<無效的運輸工具型號>
 STR_NEWGRF_INVALID_INDUSTRYTYPE                                 :<無效工業>
 
 # Placeholders for other invalid stuff, e.g. vehicles that have gone (Game Script).
+STR_INVALID_VEHICLE                                             :<種類不明的運輸工具>
 
 # NewGRF scanning window
 STR_NEWGRF_SCAN_CAPTION                                         :{WHITE}正在掃描 NewGRF 套件