This paper informs about the shipowner's aim and the operating experiences in the modernized power plant in the M.S. TACOMA MARU built in June 1962. Before the practical designing, we took up the study about crew's working hours and kinds in the engine room of ordinary vessels, and caught the fact that most of the crew's working hours were expended in watching and inspecting the machineries. Therefore we have decided to place a central controlling station at the reasonable position in the engine room where it is possible to manoeuvre the main engine and to watch remotely the running conditions of the vital motors. We have widely adopted the automatic controlling systems in every part of the power plant. Now it is found that the modernization, in our vessel, has shown its effective usefulness in the practical operations.