Answer:
I run through hills. I veer around mountains. I leap over rivers and crawl through the forests. Step out your door to find me. What am I?
I come with a train and go with a train and the train doesn't need me but can't go without me.
I'm a word that is not even strange. What am I?
I save lives on the ground and in the air
When I get closer my tail grows longer but when I go away my tail leads the way.
Why is the letter B always cool?