Don't worry, it will be wonderful.
4 seconds sound clip from the An American Tail: Fievel Goes West movie soundboard.
You can hear this line at 00:15:48 in the Blu-ray version of the movie.
Quote context
[...]
- I miss you and I hope I see you again sometime. Your best friend, Fievel.
- Train, the train! They're taking the train.
- Hurry, Mama. The train won't wait.
- Don't worry, it will be wonderful.
- Alas, poor Yorick. I knew him well.
- Look, Mama! An actor and a singer.
- Stop that. You shouldn't stare at the people less fortunate than yourself.
- Last call, all passengers bound for Altuna, Akron, Elkhart, Oskaloosa and Green River.
[...]