Abstract: The post and rail assembly comprises a post member, rail members, stiffening bars and a plurality of paling members. The rail members connect to the post member, the paling members connect to the rail members. Stiffening bars are entered into said rail member until they straddle one established paling member. Stiffening bars project an equal distance past the sides of the post member. Stiffening bars are adapted to pass through the rail and post members. Stiffening bars are adapted to straddle fence palings and to fill the cavity between the palings and the internal walls of the fence rails.