construction digger Dirt excavator machine meadow tool tracked tracked vehicle vehicle car caterpillar road snow track tracks tractor wheel winter articulated arm bucket build cab dig engine engineering vehicle heavy hole icon minning pictogram sign symbol work abstract angled angles appearance caterpillar-track continuous-track continuous-tread-band mobility movement propulsion tank-tread track-plates vehicle-propulsion weight-distribution wheels World-War-2-tank-track WWII-tank decay gravel industrial old rust workplace armored army fighting germany half-track Hanomag military nazi panzer SdKfz 251 Sonderkraftfahrzeug war highlands narrow passing place scotland signpost single warning metal onderkraftfahrzeug steel