Disclaimer: This is a hard one. You'll likely search for a long time before finding it tucked away, or you may walk away empty handed like many before you. Don't come looking if you don't have time for it!
Apparently the train used to have a geocache but it's been gone for a while. We had lunch in the park today and decided the train needs a new geocache. This is also #11 in this series.
It's in a tricky spot, so be prepared for a search. No useful hints, just keep looking! Lots of hiding places here, so please be sure to replace it back exactly where you found it.
Gramma is local to the area, so she's checking up on this series for me when needed.