Answer:
Long and thin, red within, with a nail at the end.
It's in your hand though you cannot feel it. Only you and time can reveal it.
What type of dress can never be worn?
You are on an electric train. Which direction will the smoke fly in?
They are the group who manages the winged engines of war.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.