Pistons are normally Aluminium. The Block , Rings and Crankshaft are Steel. However they are still Mega & Giant size. That is why 16 of these give an HP output from 3000 to 4000 HP , depending upon the Model.

If a keen Mechanical Engineering student is given an oppourtunity to just work in this Loco Shed free of charge for six months, he or she will have acheaved knowledge equal to a Phd in Mega Diesel Engeneering. Massive ! ! !.

These are gigantic! Each one must be at least 50kg.