The correct answer is: 02.
A wooden wedge is a piece of wood that is used to split or separate other pieces of wood. It is typically tapered on one end and has a flat or curved surface on the other end. The tapered end is inserted into the wood that is to be split, and the flat or curved surface is used to apply pressure to the wood. This pressure causes the wood to split along the grain.
EMU trains of harbour line have two wooden wedges. These wedges are used to secure the wheels of the train to the axles. The wedges are inserted into slots in the axles and then tightened with a wrench. This ensures that the wheels do not come off the axles while the train is in motion.
Option A: 02 is the correct answer.
Option B: 04 is incorrect. EMU trains of harbour line have two wooden wedges, not four.
Option C: 06 is incorrect. EMU trains of harbour line have two wooden wedges, not six.
Option D: 08 is incorrect. EMU trains of harbour line have two wooden wedges, not eight.