Diesel Engines Yesterday, Today, and Tomorrow Diesels are workhorse engines. That’s why you find them powering heavy-duty trucks, buses, tractors, and trains, not to mention large ships, bulldozers, cranes, and other construction equipment. In the past, diesels fit the stereotype of muscle-bound behe-moths. They were dirty and sluggish, smelly and loud. That image doesn’t apply to today’s diesel engines, however, and tomorrow’s diesels will show even greater improvements.
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