diff --git a/user_code/assets.py b/user_code/assets.py
index 67b7384..0f19d7d 100644
--- a/user_code/assets.py
+++ b/user_code/assets.py
@@ -4,15 +4,27 @@ from dagster import (
     AssetExecutionContext,
     Output,
     MetadataValue,
-    AutomationCondition
+    AutomationCondition,
+    DynamicPartitionsDefinition,
+    sensor,
+    RunRequest,
+    SkipReason,
+    SensorEvaluationContext,
+    DefaultSensorStatus,
+    Config
 )
 from dagster_duckdb import DuckDBResource
 from resources import MobilityDatabaseAPI
 import json
+import requests
+from pathlib import Path
+from datetime import datetime, timedelta
+import logging
+from typing import Optional
 
 
 @asset(
-    group_name="gtfs_metadata",
+    group_name="config",
     )
 def agency_list(duckdb: DuckDBResource) -> None:
     """Load agency list from CSV into DuckDB."""
@@ -139,3 +151,554 @@ def gtfs_feed_metadata(
             "preview": MetadataValue.md(preview_df.to_markdown(index=False))
         }
     )
+logger = logging.getLogger(__name__)
+
+# Dynamic partition definition for GTFS feeds
+gtfs_feeds_partitions_def = DynamicPartitionsDefinition(name="gtfs_feeds")
+
+@asset(
+    deps=["gtfs_feed_metadata"],
+    group_name="gtfs_metadata",
+    automation_condition=AutomationCondition.eager()
+)
+def gtfs_feed_partitions(
+    context: AssetExecutionContext,
+    duckdb: DuckDBResource,
+) -> Output[None]:
+    """
+    Update the dynamic partitions based on feeds in gtfs_feed_metadata table.
+    Creates one partition per feed_id.
+    """
+    with duckdb.get_connection() as conn:
+        feed_ids = conn.execute("""
+            SELECT feed_id
+            FROM gtfs_feed_metadata
+            WHERE producer_url IS NOT NULL AND producer_url != ''
+            ORDER BY feed_id
+        """).fetchall()
+
+        feed_id_list = [feed_id for (feed_id,) in feed_ids]
+
+    # Update the dynamic partitions
+    context.instance.add_dynamic_partitions(
+        partitions_def_name="gtfs_feeds",
+        partition_keys=feed_id_list
+    )
+
+    context.log.info(f"Updated partitions with {len(feed_id_list)} feeds")
+
+    return Output(
+        None,
+        metadata={
+            "feed_count": len(feed_id_list),
+            "feeds": MetadataValue.md("\n".join(f"- {f}" for f in feed_id_list[:20]))
+        }
+    )
+
+
+@asset(
+    partitions_def=gtfs_feeds_partitions_def,
+    deps=["gtfs_feed_partitions"],
+    group_name="gtfs_downloads",
+    automation_condition=AutomationCondition.on_cron("0 * * * *") | AutomationCondition.eager(),
+)
+def gtfs_feed_downloads(
+    context: AssetExecutionContext,
+    duckdb: DuckDBResource,
+) -> Output[None]:
+    """
+    Download GTFS feed for each agency partition.
+    Only downloads if there's a new version available based on Last-Modified header.
+    Files are saved to data/raw/gtfs/<feed_id>/<yyyy-mm-dd-HHMMSS-gtfs.zip>
+    Runs on the hour and whenever new partitions are added.
+    """
+    feed_id = context.partition_key
+
+    with duckdb.get_connection() as conn:
+        # Create download tracking table if it doesn't exist
+        conn.execute("""
+            CREATE TABLE IF NOT EXISTS gtfs_download_history (
+                feed_id VARCHAR,
+                download_url VARCHAR,
+                last_modified TIMESTAMP,
+                file_path VARCHAR,
+                file_size_bytes BIGINT,
+                downloaded_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                PRIMARY KEY (feed_id, last_modified)
+            )
+        """)
+
+        # Get the download URL for this feed
+        feed_info = conn.execute("""
+            SELECT feed_id, provider, producer_url
+            FROM gtfs_feed_metadata
+            WHERE feed_id = ?
+        """, [feed_id]).fetchone()
+
+        if not feed_info:
+            raise ValueError(f"Feed {feed_id} not found in metadata")
+
+        feed_id, provider, download_url = feed_info
+
+        if not download_url:
+            context.log.warning(f"No download URL for {feed_id}")
+            return Output(None, metadata={"status": "no_url"})
+
+        # Check the Last-Modified header without downloading the full file
+        try:
+            head_response = requests.head(
+                download_url,
+                timeout=30,
+                allow_redirects=True
+            )
+            head_response.raise_for_status()
+
+            last_modified_str = head_response.headers.get('Last-Modified')
+            if last_modified_str:
+                last_modified = datetime.strptime(
+                    last_modified_str,
+                    '%a, %d %b %Y %H:%M:%S GMT'
+                )
+            else:
+                # If no Last-Modified header, use current time
+                last_modified = datetime.now()
+                context.log.warning(f"No Last-Modified header for {feed_id}, using current time")
+
+        except Exception as e:
+            context.log.error(f"Failed to check headers for {feed_id}: {e}")
+            return Output(None, metadata={"status": "error", "error": str(e)})
+
+        # Check if we've already downloaded this version
+        existing = conn.execute("""
+            SELECT file_path, downloaded_at
+            FROM gtfs_download_history
+            WHERE feed_id = ? AND last_modified = ?
+            ORDER BY downloaded_at DESC
+            LIMIT 1
+        """, [feed_id, last_modified]).fetchone()
+
+        if existing:
+            file_path, downloaded_at = existing
+            context.log.info(
+                f"Already have latest version of {feed_id} "
+                f"(modified: {last_modified}, downloaded: {downloaded_at})"
+            )
+            return Output(
+                None,
+                metadata={
+                    "status": "up_to_date",
+                    "last_modified": last_modified.isoformat(),
+                    "existing_file": file_path,
+                    "downloaded_at": downloaded_at.isoformat()
+                }
+            )
+
+        # Download the file
+        context.log.info(f"Downloading new version of {feed_id} (modified: {last_modified})")
+
+        # Create directory structure: data/raw/gtfs/<feed_id>/
+        feed_dir = Path(f"data/raw/gtfs/{feed_id}")
+        feed_dir.mkdir(parents=True, exist_ok=True)
+
+        # Filename format: yyyy-mm-dd-gtfs.zip (using last_modified date)
+        filename = f"{last_modified.strftime('%Y-%m-%d-%H%M%S')}-gtfs.zip"
+        file_path = feed_dir / filename
+
+        try:
+            response = requests.get(download_url, timeout=120, stream=True)
+            response.raise_for_status()
+
+            # Write file in chunks to handle large files
+            with open(file_path, 'wb') as f:
+                for chunk in response.iter_content(chunk_size=8192):
+                    f.write(chunk)
+
+            file_size = file_path.stat().st_size
+
+            # Record the download in history
+            conn.execute("""
+                INSERT INTO gtfs_download_history (
+                    feed_id, download_url, last_modified, file_path, file_size_bytes
+                ) VALUES (?, ?, ?, ?, ?)
+            """, [feed_id, download_url, last_modified, str(file_path), file_size])
+
+            context.log.info(
+                f"✓ Downloaded {feed_id} to {file_path} ({file_size:,} bytes)"
+            )
+
+            return Output(
+                None,
+                metadata={
+                    "status": "downloaded",
+                    "file_path": str(file_path),
+                    "file_size_mb": round(file_size / 1024 / 1024, 2),
+                    "last_modified": last_modified.isoformat(),
+                    "provider": provider,
+                    "download_url": download_url,
+                }
+            )
+
+        except Exception as e:
+            context.log.error(f"Failed to download {feed_id}: {e}")
+            # Clean up partial file if it exists
+            if file_path.exists():
+                file_path.unlink()
+            return Output(
+                None,
+                metadata={
+                    "status": "error",
+                    "error": str(e),
+                    "feed_id": feed_id
+                }
+            )
+
+@asset(
+    deps=["agency_list"],
+    group_name="gtfs_rt_metadata",
+    automation_condition=AutomationCondition.eager()
+)
+def gtfs_rt_vehicles_metadata(
+    context: AssetExecutionContext,
+    duckdb: DuckDBResource,
+    mobility_db: MobilityDatabaseAPI
+) -> Output[None]:
+    """
+    Fetch GTFS-RT vehicle feed metadata from Mobility Database API for all agencies and store in DuckDB. Create the download history table in DuckDB
+    """
+
+    with duckdb.get_connection() as conn:
+        conn.execute("""
+            CREATE TABLE IF NOT EXISTS gtfs_rt_vehicles_metadata (
+                feed_id VARCHAR PRIMARY KEY,
+                provider VARCHAR,
+                status VARCHAR,
+                official BOOLEAN,
+                producer_url VARCHAR,
+                authentication_type INTEGER,
+                authentication_info_url VARCHAR,
+                api_key_parameter_name VARCHAR,
+                license_url VARCHAR,
+                feed_contact_email VARCHAR,
+                raw_json JSON,
+                fetched_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            )
+        """)
+
+        # Create the download history table
+        conn.execute("""
+            CREATE TABLE IF NOT EXISTS gtfs_rt_vehicles_download_history (
+                feed_id VARCHAR,
+                download_url VARCHAR,
+                last_modified TIMESTAMP,
+                file_path VARCHAR,
+                file_size_bytes BIGINT,
+                downloaded_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                PRIMARY KEY (feed_id, downloaded_at)
+            )
+        """)
+
+        # Get all GTFS-RT vehicle feed IDs from agency_list
+        feed_ids = conn.execute("""
+            SELECT DISTINCT "GTFS-RT_vehicles" as feed_id
+            FROM agency_list
+            WHERE "GTFS-RT_vehicles" IS NOT NULL AND "GTFS-RT_vehicles" != ''
+        """).fetchall()
+
+        context.log.info(f"Found {len(feed_ids)} GTFS-RT vehicle feeds to fetch")
+
+        successful = 0
+        failed = 0
+
+        for (feed_id,) in feed_ids:
+            try:
+                feed_info = mobility_db.get_feed_info(feed_id)
+
+                # Extract relevant fields
+                source_info = feed_info.get("source_info", {})
+
+                # Insert or update the record
+                conn.execute("""
+                    INSERT OR REPLACE INTO gtfs_rt_vehicles_metadata (
+                        feed_id,
+                        provider,
+                        status,
+                        official,
+                        producer_url,
+                        authentication_type,
+                        authentication_info_url,
+                        api_key_parameter_name,
+                        license_url,
+                        feed_contact_email,
+                        raw_json
+                    ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+                """, [
+                    feed_id,
+                    feed_info.get("provider"),
+                    feed_info.get("status"),
+                    feed_info.get("official"),
+                    source_info.get("producer_url"),
+                    source_info.get("authentication_type"),
+                    source_info.get("authentication_info_url"),
+                    source_info.get("api_key_parameter_name"),
+                    source_info.get("license_url"),
+                    feed_info.get("feed_contact_email"),
+                    json.dumps(feed_info)
+                ])
+
+                context.log.info(f"✓ Fetched and stored metadata for {feed_id}")
+                successful += 1
+
+            except Exception as e:
+                context.log.error(f"✗ Failed to fetch {feed_id}: {e}")
+                failed += 1
+
+        # Get summary stats
+        total_records = conn.execute(
+            "SELECT COUNT(*) FROM gtfs_rt_vehicles_metadata"
+        ).fetchone()[0]
+
+        # Get preview for metadata
+        preview_df = conn.execute("""
+            SELECT feed_id, provider, status, producer_url
+            FROM gtfs_rt_vehicles_metadata
+            LIMIT 5
+        """).df()
+
+    return Output(
+        None,
+        metadata={
+            "total_feeds": len(feed_ids),
+            "successful": successful,
+            "failed": failed,
+            "total_records_in_db": total_records,
+            "preview": MetadataValue.md(preview_df.to_markdown(index=False))
+        }
+    )
+
+# Dynamic partition definition for GTFS-RT vehicle feeds
+gtfs_rt_vehicles_partitions_def = DynamicPartitionsDefinition(name="gtfs_rt_vehicles")
+
+
+@asset(
+    deps=["gtfs_rt_vehicles_metadata"],
+    group_name="gtfs_rt_metadata",
+    automation_condition=AutomationCondition.eager()
+)
+def gtfs_rt_vehicles_partitions(
+    context: AssetExecutionContext,
+    duckdb: DuckDBResource,
+) -> Output[None]:
+    """
+    Update the dynamic partitions based on feeds in gtfs_rt_vehicles_metadata table.
+    Creates one partition per feed_id.
+    """
+    with duckdb.get_connection() as conn:
+        feed_ids = conn.execute("""
+            SELECT feed_id
+            FROM gtfs_rt_vehicles_metadata
+            WHERE producer_url IS NOT NULL AND producer_url != ''
+            ORDER BY feed_id
+        """).fetchall()
+
+        feed_id_list = [feed_id for (feed_id,) in feed_ids]
+
+    # Update the dynamic partitions
+    context.instance.add_dynamic_partitions(
+        partitions_def_name="gtfs_rt_vehicles",
+        partition_keys=feed_id_list
+    )
+
+    context.log.info(f"Updated partitions with {len(feed_id_list)} GTFS-RT vehicle feeds")
+
+    return Output(
+        None,
+        metadata={
+            "feed_count": len(feed_id_list),
+            "feeds": MetadataValue.md("\n".join(f"- {f}" for f in feed_id_list[:20]))
+        }
+    )
+
+class GTFSRTDownloadConfig(Config):
+    provider: str
+    producer_url: str
+
+@asset(
+    partitions_def=gtfs_rt_vehicles_partitions_def,
+    deps=[gtfs_rt_vehicles_partitions],
+    group_name="gtfs_rt_downloads",
+)
+def gtfs_rt_vehicles_downloads(
+    context: AssetExecutionContext,
+    config: GTFSRTDownloadConfig,
+    duckdb: DuckDBResource,
+) -> Output[None]:
+    """
+    Download GTFS-RT vehicle feed for each agency partition.
+    Only downloads if the Last-Modified date has changed from the previous download.
+    Files are saved to data/raw/gtfs-rt/vehicles/<feed_id>/YYYY/MM/DD/<HHMMSS>.pb
+    Filename and directory structure use the Last-Modified timestamp.
+    """
+    feed_id = context.partition_key
+    download_url = config.producer_url
+    provider = config.provider
+
+    with duckdb.get_connection() as conn:
+
+        # Check the Last-Modified header without downloading the full file
+        try:
+            head_response = requests.head(
+                download_url,
+                timeout=30,
+                allow_redirects=True
+            )
+            head_response.raise_for_status()
+
+            last_modified_str = head_response.headers.get('Last-Modified')
+            if last_modified_str:
+                last_modified = datetime.strptime(
+                    last_modified_str,
+                    '%a, %d %b %Y %H:%M:%S GMT'
+                )
+            else:
+                # If no Last-Modified header, use current time (will always download)
+                last_modified = datetime.now()
+                context.log.warning(f"No Last-Modified header for {feed_id}, will download")
+
+        except Exception as e:
+            context.log.error(f"Failed to check headers for {feed_id}: {e}")
+            return Output(None, metadata={"status": "error", "error": str(e)})
+
+        # Check if we've already downloaded this version
+        existing = conn.execute("""
+            SELECT file_path, downloaded_at
+            FROM gtfs_rt_vehicles_download_history
+            WHERE feed_id = ? AND last_modified = ?
+            ORDER BY downloaded_at DESC
+            LIMIT 1
+        """, [feed_id, last_modified]).fetchone()
+
+        if existing:
+            file_path, downloaded_at = existing
+            context.log.info(
+                f"Already have latest version of {feed_id} "
+                f"(modified: {last_modified}, downloaded: {downloaded_at})"
+            )
+            return Output(
+                None,
+                metadata={
+                    "status": "up_to_date",
+                    "last_modified": last_modified.isoformat(),
+                    "existing_file": file_path,
+                    "downloaded_at": downloaded_at.isoformat(),
+                    "provider": provider,
+                }
+            )
+
+        # Download the file
+        download_time = datetime.now()
+
+        context.log.info(f"Downloading new version of {feed_id} (modified: {last_modified})")
+
+        # Create directory structure using last_modified date: data/raw/gtfs-rt/vehicles/<feed_id>/YYYY/MM/DD
+        feed_dir = Path(f"data/raw/gtfs-rt/vehicles/{feed_id}/{last_modified.strftime('%Y/%m/%d')}")
+        feed_dir.mkdir(parents=True, exist_ok=True)
+
+        # Filename format: HHMMSS.pb (using last_modified time)
+        filename = f"{last_modified.strftime('%Y%m%d%H%M%S')}.pb"
+        file_path = feed_dir / filename
+
+        try:
+            response = requests.get(download_url, timeout=30)
+            response.raise_for_status()
+
+            # Write the protobuf data
+            with open(file_path, 'wb') as f:
+                f.write(response.content)
+
+            file_size = file_path.stat().st_size
+
+            # Record the download in history
+            conn.execute("""
+                INSERT INTO gtfs_rt_vehicles_download_history (
+                    feed_id, download_url, last_modified, file_path, file_size_bytes, downloaded_at
+                ) VALUES (?, ?, ?, ?, ?, ?)
+            """, [feed_id, download_url, last_modified, str(file_path), file_size, download_time])
+
+            return Output(
+                None,
+                metadata={
+                    "status": "downloaded",
+                    "file_path": str(file_path),
+                    "file_size_kb": round(file_size / 1024, 2),
+                    "last_modified": last_modified.isoformat(),
+                    "downloaded_at": download_time.isoformat(),
+                    "provider": provider,
+                    "download_url": download_url
+                }
+            )
+
+        except Exception as e:
+            context.log.error(f"Failed to download {feed_id}: {e}")
+            # Clean up partial file if it exists
+            if file_path.exists():
+                file_path.unlink()
+            return Output(
+                None,
+                metadata={
+                    "status": "error",
+                    "error": str(e),
+                    "feed_id": feed_id
+                }
+            )
+
+@sensor(
+    name="gtfs_rt_vehicles_sensor",
+    minimum_interval_seconds=60,
+    asset_selection=[gtfs_rt_vehicles_downloads],
+    default_status=DefaultSensorStatus.RUNNING
+)
+def gtfs_rt_vehicles_sensor(
+    context: SensorEvaluationContext,
+    duckdb: DuckDBResource,
+) -> list[RunRequest] | SkipReason:
+    """
+    Sensor that triggers gtfs_rt_vehicles_downloads every 60 seconds.
+    Fetches feed metadata once and passes it to each partition run.
+    """
+    with duckdb.get_connection() as conn:
+        # Get all active feeds with their metadata in one query
+        feeds = conn.execute("""
+            SELECT feed_id, provider, producer_url
+            FROM gtfs_rt_vehicles_metadata
+            WHERE producer_url IS NOT NULL AND producer_url != ''
+            ORDER BY feed_id
+        """).fetchall()
+
+        if not feeds:
+            return SkipReason("No GTFS-RT vehicle feeds configured")
+
+        # Create a RunRequest for each partition with metadata
+        run_requests = [
+            RunRequest(
+                partition_key=feed_id,
+                run_config={
+                    "ops": {
+                        "gtfs_rt_vehicles_downloads": {
+                            "config": {
+                                "provider": provider,
+                                "producer_url": producer_url,
+                            }
+                        }
+                    }
+                },
+                tags={
+                    "feed_id": feed_id,
+                    "sensor": "gtfs_rt_vehicles_sensor"
+                }
+            )
+            for feed_id, provider, producer_url in feeds
+        ]
+
+        context.log.info(f"Triggering downloads for {len(run_requests)} GTFS-RT vehicle feeds")
+
+        return run_requests
\ No newline at end of file
diff --git a/user_code/definitions.py b/user_code/definitions.py
index 7795743..f8d4515 100644
--- a/user_code/definitions.py
+++ b/user_code/definitions.py
@@ -19,7 +19,8 @@ defs = Definitions(
             "asset_automation_sensor",
             target="*",
             default_status=DefaultSensorStatus.RUNNING,
-        )
+        ),
+        assets.gtfs_rt_vehicles_sensor
     ],
     resources={
         "duckdb": DuckDBResource(