How close does the train go near the park?

The closest stop is navy yard. The walk to the park is about 5 minutes to the center field gate.

Two exits for the train. If taking the stadium exit, straight shot 5 minute or less walk (you'll see the stadium from the exit). If you go to Dept of Transportation exit, you have to walk down M St a bit, maybe 10-12 minute walk.

1.5 city blocks

5 minutes