Insulating rubber rail seat

Claim 1

A RAIL SEAT FOR SUPPORTING A TRACTION RAIL ON A SUPPORTING STRUCTURE COMPRISING A PREFORMED RESILIENT PAD FORMED OF AN ELASTOMERIC MATERIAL HAVING A PRIMARY INGREDIENT OF NATURALL RUBBER, SAID PAID HAVING IN ITS TOP FACE A LONGITUDINALLY EXTENDING GROOVE WITH UNDERCUT EDGES DEFINING A RAIL BASE FLANGE RECEIVING CAVITY AND AN OUTER LONGITUDINAL MARGINAL EDGE PORTION ON EACH OF SAID LONGITUDINALLY EXTENDING GROOVE, SAID RAIL BASE FLANGE RECEIVING CAVITY HAVING A TRANSVERSE CROSS-SECTIONAL SHAPE COMPEMENTARY TO THE RAIL BASE FLANGE AND A VERTICAL HEIGHT AT ANY POINT AS GREAT AS THE THICKNESS OF THE RAIL FLANGE AT THAT POINT WHEREBY THE POTION OF THE PAD ADJACENT THE UNDERCUT EDGES OF THE GROOVE OF SAID PAD IS IN A COMPLETELY RELAXED POSITION WHEN THE RAIL FLANGE IS RECEIVED IN THE CAVITY, SAID PAD HAVING A PAIR OF LONGITUDINALLY SPACED PREPUNCHED HOLES THROUGH EACH OF THE OUTER LONGITUDINAL MARGINAL EDGE PORTIONS THEREOF SPACED OUTWARDLY FROM THE LONGITUDINAL EDGES OF THE RAIL BASE FLANGE RECEIVING CAVITY IN ITS REGION OF GREATEST WIDTH BY AT LEAST 3/8 OF AN INCH, AND SAID PAD HAVING AN ELONGATED RECESS ON THE UPPER FACE OF EACH OF THE LONGITUDINAL MARGINAL EDGE PORTIONS THEREOF SPACED FROM THE LONGITUDINAL EDGE OF THE GROOVE IN THE UPPER FACE OF THE PAD, EACH OF SAID RECESSES ON THE UPPER FACE OF EACH MARGINAL EDGE PORTION OF SAID PAD EXTENDING OVER THE PAIR OF HOLES IN THE MARGINAL EDGE PORTION, AND OVER THE INNER LONGITUDINALLY EXTENDING UNDERCUT EDGE OF SAID FLANGE-RECEIVING CAVITY AND EACH RECESS HAVING AN INNER LONGITUDINALLY EXTENDING EDGE PARALLEL TO THE ADJACENT INNERMOST LONGITUDINALL EDGE OF SAID GROOVE, SAID RECESSES PROVIDING AN ELONGATED BEARING SURFACE OF SAID BEARING PLATE RECEIVED THEREIN.