update locaomotive and fix wagon transfer issue

apps/edr-freight-api/src/modules/train-scheduling/booking-journey.service.ts

@@ -487,7 +487,13 @@ export class BookingJourneyService {
           currentYardId: booking.destinationYardId,
           currentTrainScheduleId: null,
           trainSetWagonId: null,
-          status: Freight.WagonStatus.Available,
+          // A wagon that belongs to a built train stays coupled to it (ASSIGNED);
+          // only loose wagons return to the open AVAILABLE pool. Marking a
+          // coupled wagon AVAILABLE made it show up in the train-builder's
+          // "available wagons" picker, where attaching it always 409'd.
+          status: wagon.trainId
+            ? Freight.WagonStatus.Assigned
+            : Freight.WagonStatus.Available,
         });
       }
     }