The world’s first hybrid dozer will cost about $100,000 more, or 20%, than a comparable non-hybrid of the same size but will do more work and pay for itself in about two and a half years, say Caterpillar Inc. managers. Performance is tracking well in field trials, said the managers on June 23, as Cat rolled out the machine for press evaluation at the firm’s training facility in Edwards, Ill. The D7E starts production in October and carries a list price of $600,000, says David E. Nicoll, product execution manager. That is 20% more than the conventional D7R but 12%
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.