Fish Plates are the flat metal plate that are used to link two pieces of metal or wood using a number of bolts or nails that go through the plate and the member. Fishplates are frequently used to link different materials, although they are most frequently connected with the joints of train tracks. The word fish refers to a wooden reinforcement that assisted a ship mast take on the correct profile when it was built up. The short dimensions of the top and bottom faces taper inward in Fish Plates