Setting
A city in the future or present, by the beach.
Point of view
First persons. The boy.
Conflict
There were no places for the lost thing to live.
Climax
The lost thing and the boy finally finds the world where the lost thing can live with the other things like him.
Symbols
The lost thing shows something important that we tend to forget when we are busy.
Train shows passing time or maybe routine.
Irony
There were no places for the lost thing in the humans city, but there was a place where he can live happily.
Theme
Don't be too busy, because you will forget or overlook something important in daily life.