Precision shaped grain abrasive rail grinding tool and manufacturing method therefor

A rail grinding abrasive assembly comprising:

• a rail grinding mounting plate;
• a track head grinder, configured to engage a first surface of a track rail, a track web grinder configured to engage a second surface of the track rail, and a track edge grinder configured to engage a third surface of the track rail, wherein one of the track head grinder, the track web grinder or the track edge grinder comprise:
• a primary abrasive portion defining a front grinding surface, the primary abrasive portion including primary precision-shaped grain abrasive particles retained in a first binder,
• a secondary abrasive portion comprising secondary precision-shaped grain abrasive particles retained in a second binder, the secondary abrasive portion bonded to the primary abrasive portion, wherein the secondary precision-shaped grain abrasive particles differ from the primary precision-shaped abrasive grain abrasive particles;
• and wherein the primary abrasive portion and the secondary abrasive portion form a single cylindrical rail grinding wheel;
• the primary abrasive portion comprises a primary grinding cylinder;
• the secondary abrasive portion comprises a secondary grinding cylinder disposed within the primary grinding cylinder;
• wherein the secondary abrasive portion comprises one or more mounting tools embedded within the secondary abrasive portion, said mounting tools selected from mounting nuts, mounting bolts, or mounting screws, said mounting tools coupling the secondary portion to the rail grinding mounting plate;
• the secondary precision-shaped grain abrasive particles adjacent to a wheel rotational axis in the secondary abrasive portion having an average alignment of less than 35 degrees with respect to the wheel rotational axis, and the primary precision-shaped grain abrasive particles adjacent to an outer circumference of the primary abrasive portion having an average alignment angle that is from 35 and 90 degrees, inclusive, with respect to the wheel rotational axis.