A rail board has a base and at least one rail extending along the base. A projection extends from a first end of the base and a socket is provided in a surface of the base at the second end thereof. At least part of the projection has an outwardly tapered profile. A method of assembling at least two rail boards having at least one rail includes arranging a first rail board having a projection extending therefrom and a second rail board having a socket formed therein such that the projection of the first rail board faces the socket of the second rail board. Connecting the projection of the first rail board with the socket of the second rail board abuts the first rail board with the second rail board to align at least one rail of the first rail board with at least one rail of the second rail board.