1. Application diversity, drive-train efficiency, and production technology characterize the middle of the crawler-dozer range.The model lineup for most manufacturers with a broad range of crawler dozers includes a “mid-range” of machines having horsepower ratings from around 130 to the mid-200s, with next smaller models usually dropping down to 100 horsepower or so, and the next largest models generally topping 300 horsepower. This mid-range category is arbitrary, of course, but it does represent the bulk of industry sales, the widest diversity of application potential, and probably more than its share of innovation, especially in drive-train and grade-control technology.