Abstract: An elongated main frame is provided including front and rear end portions. An elongated dual track endless track drive assembly is oscillatably supported from the rear end portion of the frame for angular displacement about a first horizontal transverse axis intermediate the opposite ends of the track drive assembly. A front dirigible ski equipped support assembly is carried by the front end portion of the frame forward of the drive assembly and an elongated longitudinally extending sub-frame including front and rear end portions is supported from the main frame front end portion for angular displacement about a second horizontal axis extending transversely of the main frame and the front end portion of the sub-frame. The rear end portion of the sub-frame includes transversely spaced depending packed and icy snow cover working times and an upstanding transverse blade member rearward of the tines including a generally horizontal lower edge portion.