Abstract: A trail mat system having a mat extending between and on top of a pair of railroad track rails; at least one rail clamp section disposed on a bottom side of the mat including a rail cavity for receiving at least a portion of the rails; at least one clamp arm included in the rail clamp section engaging one of the rails; and, a securing fastener operatively associated with the at least one clamp arm to bias the clamp arm against the rail to prevent separation of the mat from the rails; whereby the mat is configured to be placed over and removably secured to the rails to provide a trail surface overtop the rails without removing the rails or other elements of the railroad track.

Abstract: An earth boring apparatus is illustrated including an engine and an earth boring string wherein a hydraulic clutch driven by the engine is supplied with hydraulic fluid through an electrically operated valve controlled by a manually operated trigger so that release of the trigger resulting from a torque as may be occasioned by encountering a rock or other obstruction interrupts manual operation of the trigger disabling the clutch.