Concrete sleeper with the fastening housing

In a railway sleeper assembly which comprises a concrete sleeper having longitudinally extending metallic reinforcing rods and a pair of fastening housings adjacent the opposite ends of the sleepers for supporting rails in spaced apart, anchored conditions, the improvement wherein each fastening housing comprises a carrier plate portion partially embedded in the concrete and presenting an exposed upper surface supporting a respective rail and having recesses receiving rail clamps to secure the respective rail in place, said fastening housing being formed of synthetic resinous material whereby said rails are electrically insulated from each other, the synthetic resinous material of the fastening housing reacting under stress not only to support the rail and any load thereon but also to anchor the rail clamp, vertically extending anchoring means integral with and depending from carrier plate portion within the concrete for maintaining said fastening housing in fixed relation to said sleeper, and means cooperating with said anchoring means and with said reinforcing rods to enhance the fixation of said fastening housings to the sleeper and to tie the opposite ends of said sleeper to each other.