Answer:
You’ll have me at night and if you remove the first letter I denote the top, such as on a train
My sides are firmly laced about, Yet nothing is within; You'll think my head is strange indeed, Being nothing else but skin.
Half-way up the hill, I see you at last, lying beneath me with your sounds and sights. A city in the twilight, dim and vast, with smoking roofs, soft bells, and gleaming lights.
Three little letters. A paradox to some. The worse that it is, the better it becomes.
It's like food but water kills it. What is it?
I’m grown from darkness but shine with a pale light. Very round I am and always a lady's delight.