Mr. Tom is a Train mechanic. He knows everything about the train, how the engine works, and stuff like that. Kids ask him a lot of questions about the train, and he answers them all. For them, he is a hero who knows everything under the sun.
Every day, he patiently waits for each train to stop at his station. He checks the trains for any repairs. His job is demanding and requires most of the time to be alert. If he fails to do his duty, the train will have an accident.