diff --git a/src/mbtaclient/handlers/trains_handler.py b/src/mbtaclient/handlers/trains_handler.py
index a1429e3..566bbb5 100644
--- a/src/mbtaclient/handlers/trains_handler.py
+++ b/src/mbtaclient/handlers/trains_handler.py
@@ -13,26 +13,28 @@ class TrainsHandler(MBTABaseHandler):
     """Handler for managing Trips."""
 
     DEFAULT_MAX_TRIPS = 1
-    
+
     @classmethod
     async def create(
         cls,
         mbta_client: MBTAClient,
-        departure_stop_name: str ,
+        departure_stop_name: str,
         arrival_stop_name: str,
         trip_name: str,
         max_trips: Optional[int] = DEFAULT_MAX_TRIPS,
-        logger: Optional[logging.Logger] = None)-> "TrainsHandler":
-
+        logger: Optional[logging.Logger] = None
+    ) -> "TrainsHandler":
         """Asynchronous factory method to initialize TripsHandler."""
         instance = await super()._create(
             mbta_client=mbta_client,
             departure_stop_name=departure_stop_name,
             arrival_stop_name=arrival_stop_name,
             max_trips=max_trips,
-            logger=logger)
-        
-        instance._logger = logger or logging.getLogger(__name__)  # Logger instance
+            logger=logger
+        )
+
+        instance._logger = logger or logging.getLogger(__name__)
+        instance._mbta_trips_id: list[str] = []  # Initialize trip ID list
 
         await instance.__update_mbta_trips_by_trip_name(trip_name)
 
@@ -46,33 +48,29 @@ async def __update_mbta_trips_by_trip_name(self, trip_name: str) -> None:
                 for mbta_trip in mbta_trips:
                     if not MBTATripObjStore.get_by_id(mbta_trip.id):
                         MBTATripObjStore.store(mbta_trip)
-                    self._mbta_trips_id = mbta_trip.id
+                    if mbta_trip.id not in self._mbta_trips_id:
+                        self._mbta_trips_id.append(mbta_trip.id)
             else:
                 self._logger.error(f"Invalid MBTA trip name {trip_name}")
                 raise MBTATripError(f"Invalid MBTA trip name {trip_name}")
-  
+
         except Exception as e:
             self._logger.error(f"Error updating MBTA trips: {e}")
             raise
 
-    async def __fetch_trips_by_name(self, train_name: str) -> Tuple[list[MBTATrip],float]:    
-
+    async def __fetch_trips_by_name(self, train_name: str) -> Tuple[list[MBTATrip], float]:
         params = {
             'filter[revenue]': 'REVENUE',
             'filter[name]': train_name
-            }
+        }
 
         mbta_trips, timestamp = await self._mbta_client.fetch_trips(params)
         return mbta_trips, timestamp
 
-
     async def update(self) -> list[Trip]:
         self._logger.debug("Updating trips scheduling and info")
         try:
-
             now = datetime.now().astimezone()
-
-            # Initialize trips
             weekly_trips: list[dict[str, Trip]] = []
 
             for i in range(8):
@@ -80,23 +78,23 @@ async def update(self) -> list[Trip]:
                 date_to_try = (now + timedelta(days=i)).strftime('%Y-%m-%d')
 
                 params = {
-                    'filter[trip]': self._mbta_trips_id,
+                    'filter[trip]': ','.join(self._mbta_trips_id),
                     'filter[date]': date_to_try
                 }
 
-                daily_updated_trip = await super()._update_scheduling(trips=daily_trip,params=params)
+                daily_updated_trip = await super()._update_scheduling(trips=daily_trip, params=params)
 
-                # Filter out departed trips
                 daily_filtered_trip = super()._filter_and_sort_trips(
                     trips=daily_updated_trip,
-                    remove_departed=False)
-                
+                    remove_departed=False
+                )
+
                 if len(daily_filtered_trip) > 0:
                     weekly_trips.append(daily_filtered_trip)
-                
+
                 if len(weekly_trips) == self._max_trips:
                     break
-                
+
                 if len(weekly_trips) == 0:
                     if i == 7:
                         self._logger.error(f"No trips between the provided stops till {date_to_try}")
@@ -105,13 +103,10 @@ async def update(self) -> list[Trip]:
 
             trains: list[Trip] = []
             for trips in weekly_trips:
-                
-                # Update stops for the trip
                 task_stops = asyncio.create_task(super()._update_mbta_stops_for_trips(trips=trips.values()))
-                # Update trip details
                 tasks_trips_details = asyncio.create_task(super()._update_details(trips=trips))
 
-                await task_stops                       
+                await task_stops
                 detailed_trip = await tasks_trips_details
 
                 trains.append(list(detailed_trip.values())[0])
@@ -121,6 +116,6 @@ async def update(self) -> list[Trip]:
         except Exception as e:
             self._logger.error(f"Error updating trips scheduling and info: {e}")
             raise
-   
+
 class MBTATripError(Exception):
     pass
diff --git a/tests/test_train_handler.py b/tests/test_train_handler.py
index 7840645..114e807 100644
--- a/tests/test_train_handler.py
+++ b/tests/test_train_handler.py
@@ -16,6 +16,7 @@
     [
         ("South Station", "Back Bay", "509"),
         ("Worcester", "South Station", "518"),
+        ("Swampscott", "North Station", "12"),
         #("West Natick", "South Station", "520"),
     ]
 )
@@ -90,4 +91,4 @@ async def test_handler(departure_stop_name, arrival_stop_name, train):
             print(f"seconds_arrival: {seconds_arrival}")
             print(f"seconds_departure: {seconds_departure}")
          
-            print("##############") 
\ No newline at end of file
+            print("##############")