Answer:
You are on an electric train. Which direction will the smoke fly in?
What starts with a T ends with a T and is full of T?
It can be done to buttons and shopping carts. What is it?
What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.
Sends paper without using the post office.
People take me on walks and I run and have fun. What am I?