Add 'm' key for 'mode' to be set only when the service is a Ship or Bus.

schemas/api/stations/board.json

@@ -63,6 +63,12 @@
                     "title": "RID",
                     "description": "Services RID"
                 },
+                "m": {
+                    "type": "string",
+                    "title": "mode",
+                    "description": "Transport mode, default value: Train",
+                    "enum": ["SHIP", "BUS"]
+                },
                 "o": {
                     "type": "string",
                     "title": "TOC",