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I have a pic of an old Holt we found in the woods, and on the radiator shrowed there was an embossed caterpiller on it. The real thing. Had a corrugated tin canopy that was rotted mostly away. I'll dig for that pic and make a scan and post it.

The crawlers compacted the soil a lot less than the wheels.

They have certainly used the high tracks a lot in the woods here since they came out.

Diesel electric has proved worth while in many applications, but this I have some wonders about. It appears to eliminate clutches, hydrostatic drives and transmissions. That's a plus, but what about the maintenance on those electric motors. They must have some massive torque.

http://gas2.org/2009/09/18/caterpillar-builds-worlds-first-hybrid-bulldozer/ Interesting that they dropped the high-track design.