Components for ballast-less railroad lines laid on pre-fabricated reinforced concrete slabs

A ballastless railroad line bed, comprising:

• an elongated steel-reinforced concrete support block, said support block being formed with spaced apart upwardly open cylindrical seats;
• a plurality of rectangular prefabricated reinforced concrete slabs along said block and supported thereby, said slabs having confronting edges along which they are provided unitarily with downwardly projecting semicylindrical protuberances of concrete, each of said seats receiving a respective semicylindrical protuberance of each of two successive slabs along said bed, whereby two protuberances extend into each seat with spacing from one another, the two protuberances in each seat having flat surfaces juxtaposed with one another and cylindrically convex surfaces turned away from one another, said two protuberances being received with all around clearance in the respective seat, said slabs and said support block defining spaces between them at least along the entire underside of said slabs;
• and
• respective layers of a yieldable concrete asphalt mortar injected into and substantially filling said spaces.