Answer:
I come with a train and go with a train and the train doesn't need me but can't go without me.
I have no voice but I can teach you all there is to know. I have spines and hinges but I am not a door. Once Iβve told you all I cannot tell you more.
I may only be given but never bought. Sinners seek me but saints do not. (one word).
The warmer I am the fresher I am.
I look like a tiny trombone
A word of five letters, Upside down is the same, A shark does this, But itβs not to blame. What is the word?