Answer:
An iron horse with a flaxen tail. The faster the horse runs, the shorter his tail becomes.
I always follow my brother but you cannot see me, only him. You cannot hear him but you can hear me. What are we?
I know a word of letters three. Add two, and fewer there will be!
In we go, out we go. All around and in a row. Always, always steady flow. When we'll stop, you'll never known. In we go, out we go.
As I walked along the path I saw something with four fingers and one thumb, but it was not flesh, fish, bone or fowl.
What covers its face with its hands, speaks no language, yet most known what it's saying?