Abstract: A magnetic rail brake device comprising at least two wear pieces manufactured from ferromagnetic material, magnetically insulated from each other by a filling piece and connected to a magnet which, in operation, are capable of providing a magnetic field extending through the wear pieces. In operation, the wear pieces are contacted with a rail so as to enable the magnetic field to close through the rail, and at least at the location of the parts to be contacted with the rail, the wear pieces comprise wear strips manufactured from nodular cast iron, and at least on the side facing the rail, the filling piece is formed from austenitic cast iron.