Add PIS item to the 'TrainDetails' response

schemas/api/trains/TrainDetails.json

@@ -1,6 +1,6 @@
 {
     "$schema": "https://json-schema.org/draft-07/schema#",
-    "title": "TrainByHeadcodeResponse",
+    "title": "TrainDetailsResponse",
     "$defs": {
         "ServiceLocation": {
             "type": "object",
@@ -216,6 +216,9 @@
             "items": {
                 "$ref": "#/$defs/ServiceLocation"
             }
+        },
+        "pis": {
+            "$ref": "../pis-object.json"
         }
     }
 }