Answer:
What is made of wood but can't be sawed?
A dagger thrust at my own heart, dictates the way I'm swayed. Left I stand, and right I yield, to the twisting of the blade.
Two bodies have I, though both joined in one. The more still I stand, the quicker I run.
What is the freedom of birds and the pen of old men?
You’ll have me at night and if you remove the first letter I denote the top, such as on a train
People take me on walks and I run and have fun. What am I?