Railroad frog crossing bolt and nut assembly for clamping railroad rail sections together

A railroad frog crossing bolt and nut assembly for clamping railroad rail sections together, each of said rail sections having a base portion and a top head portion separated by an integrally formed web portion having at least one bolt opening extending therethrough which registers with the bolt opening in the web portion of the other rail section, each of said web portions having oppositely disposed inner and outer side wall portions, comprising:

• a bolt having a head from which extends an elongated shank having an unthreaded shank portion extending from said head and terminating at a threaded shank portion;
• the juncture of said unthreaded shank portion and said head being radiused to provide a first annular radiused surface;
• a nut adapted to be threadably mounted on said threaded shank portion and having inner and outer surfaces;
• said inner surface of said nut being radiused to provide a second annular radiused surface;
• a first member positioned adjacent said outer side wail portion of said web of one of said rail sections and having inner and outer surfaces;
• said first member having a bolt opening formed therein which extends therethrough between said inner and outer surfaces thereof;
• said outer surface of said first member having a recessed countersink area formed therein extending around said bolt opening adapted to receive one of said first and second radiused surfaces;
• a second member positioned adjacent said outer side wall portion of said web of the other of said rail sections and having inner and outer surfaces;
• said second member having a bolt opening formed therein which extends therethrough between said inner and outer surfaces thereof;
• said outer surface of said second member having a recessed countersink area formed therein extending around said bolt opening adapted to receive the other of said first and second radiused surfaces.