http://louisville.craigslist.org/hvo/4893854608.html Found this jewel today. I don't know much about these but it looks like a good size machine. I think most people have 175?
At rough 46,000 pounds similar in size to 977 Cat, DVT 573 V8 IHC engine Quite a horse: http://murphyused.com/images/specs/546.pdf If has 8.5 pitch rails could get replacements pretty easy from Cat or Deere, 7.5 might be harder to find.