> Unless you don't happen to live within the city center. Train stations frequently have zero long term parking, while airport frequently have cheap or even free long term parking. If you need to take the train where I live, then you're better of driving to the airport and park there. Then take a train or bus to the city center and the train station.

If you'd have to pay for long-term parking, why not instead pay for a taxi or Uber to the train station?