Answer:
In a tunnel of darkness lies a beast of iron. I can only attack when pulled back. What am I?
I have two bodies joined together as one. When standing still, I run and run. What am I?
You can see it everyday, but cannot touch it at will. What is it?
I am always coming but I never arrive. What am I?
I can be driven but have no wheels. I can be sliced but still remains whole
What language does a billboard speak?