diff --git a/schemas/api/trains/TrainByHeadcode.json b/schemas/api/trains/TrainByHeadcode.json
index c22886f..21e9ca6 100644
--- a/schemas/api/trains/TrainByHeadcode.json
+++ b/schemas/api/trains/TrainByHeadcode.json
@@ -36,6 +36,12 @@
             "description": "The TOC operating the service",
             "minLength": 2,
             "maxLength": 2
+        },
+        "ct": {
+            "type": "boolean",
+            "title": "Cancelled Throughout",
+            "name": "Cancelled Throughout",
+            "description": "Whether the train is cancelled throughout"
         }
     }
 }
\ No newline at end of file