After Nachhilfe.. Talking to the kid’s mother about various things, I ask if she has any experience of travelling by train in or through the baltic countries. She didn’t personally, but..
“My husband does. He’s the best person to ask.. He’s a train expert.. Let’s ask him” <calls husband>
Kid’s Mother: “Jess wants to know the best way to get to Tallinn by train” <expectant look>
<husband looks at me>
KM: “I told her you were the best person to ask”
<husband looks at me>
KM: “she wants to take her bike.. There’s bound to be a connection, right?”
<husband looks at me>
KM: <nudges husband slightly impatiently>
Husband: Take the ferry.
***
This seems to be the best solution.