Diesel engine
 Diesel engines make very good use of the fuel they burn. An engine with a lot of torque will be able to spin its shaft even if it is very hard to do. This makes a diesel engine a good choice in heavy equipment like trucks, trains and construction machines. The very big trucks on the road have diesels in them. So do trains, unless they are steam-powered. Sometimes, even the torque of a diesel engine is not enough to run such big machines.