My prefix has a value when defined,
My infix has value when it's refined.
My suffix is not usually moved,
My whole is after something's been removed.
What am I?
If you steal my infix, you may end up at my suffix.
Same answer but not necessarily the same prefix/suffix/infix:
My prefix does not play but is part of the game,
My suffix is a place for passengers of a train.
My infix is shouted as warning of danger overhead,
My whole can make a specific type of bed.