With filigree brass mast, authentic varnishing and under baseboard drive unit. Disk is moveable and lighted. With one LED, maintenace-free. Different kind of block signals are possible by railway. As block signal item-No. 4517 is a version with flange socket which is single standing by the track, the block signal item-No. 4515 is lower standard design. It is used e.g. direct in fromt of home signal. Height 55 mm.