and development of the PA5, with a 255 mm bore. The nine-cylinder PC20 engines developed for the Sovereign of the Seas (268 meters) were mounted on rubber pads to reduce noise and vibrations in the cabins. Locomotives The PA4 unit with a 185 mm bore was designed specifically for the locomotive market. Over 44,2% of all the engines produced in the history of SEMT were destined for locomotives. Thermal power plants (EDF) began using SEMT engines for its diesel-powered plants in the 1950s. EDF later equipped plants in France's overseas territories and dominions with 18 PC4.2 V engines. The PC engines for diesel-fueled electricity generating plants were installed throughout Japan, having numerous islands that need to be autonomous in terms of power production. Auxiliary power for nuclear plants SEMT. Pielstick engines were used in many countries for backup power supplies to nuclear plants. Shareholder evolution 1987: The actions are shared in 3: 49% by Alsthom 25.5% by MTU 25.5% by MAN 1990: Shares are shared equally by Alsthom, MTU and MAN (33.3% each). 2006: 100% of Pielstick's shares are held by MAN and become the sole shareholder. External links www.pielstick.com Engine manufacturers of France Marine engine manufacturers Diesel engine manufacturers