That Cat is a forrestry-rigged D-8 (vintage somewhere around late 70s-early 80s, if I recall correctly), powered by a 310 HP 6Cyl, Roots-type supercharged Caterpillar Diesel - in working trim as pictured with its blade, cage, brush screens, winch, engine shroud, spark-arrester exhaust, extra-wide "low ground pressure" tracks, and rear-mounted log grappler, it prolly weighs pretty damned close to 100,000 pounds. Top end is somewhere around 9, mebbe on a good day, 10 MPH, from a standing start it'll get there in just under a minute, and when its working hard, it'll go through around 350 gallons of fuel (roughly 2 tanks) over a 10 hour shift. Though paid for many years ago, the puppy's cost of operation, considering fuel, lubricants, coolant, hydraulic fluid, maintenance, insurance/permits/other administrative fees and charges, and operator, averages just under $75.00/hr.
Assuming you don't break anything you can't refit or reweld right there on the worksite, of course; hauling it anywhere ain't cheap at all either, even if you already own the necessary truck, trailer, and overweight/oversize permits