My FastAPI backend deployment is failing after build succeeds.

Current setup:

• Root Directory: backend

• Start Command:

  uvicorn main:app --host 0.0.0.0 --port $PORT

Project structure:

USE AI_MalayalamAI/

├── backend/

│ ├── main.py

│ ├── requirements.txt

│ ├── app/

│ └── ...

├── frontend/

└── ...

Build logs complete successfully and Docker image is created, but Deploy Logs show:

“No logs in this time range”

The service never starts running.

I also generated a public domain and set target port to 8000.

Please help diagnose:

1. Why the deployment container is not starting
2. Whether Railway is detecting the correct port
3. Whether there is a startup/runtime crash before logging
4. Whether memory limits or heavy dependencies (WhisperX / Torch) are causing silent failure
5. Whether the service exposure/networking configuration is correct

Please provide the exact fix steps.