Answer:
An iron horse with a flaxen tail. The faster the horse runs, the shorter his tail becomes.
It is weightless, you can see it. If you put it in a barrel it will make it lighter?
What goes in, but never through? I've got some and so do you. We might lend one, or even two, but only if our trust is true.
What is the freedom of birds and the pen of old men?
I usually wear a yellow coat. I usually have a dark head. I make marks wherever I go.
What is so fragile that saying its name breaks it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?