An oil or gas burning electricity generating power plant has a thermal efficiency of about 95%. A car engine has about a 30% thermal efficiency. The numbers are even better for a wind turbine or a solar farm.
It's just another way to preserve a few more of them. We all turn into our grandfathers at some point and we will be polishing and parading these relics like my grandpa at his "steam rallies" in England, or some of those old guys who dress up and fire Brown Besses.
Being able to put an electric motor in these things means some of them can continue to be used in big cities where anything burning oil will undoubtedly be banned, instead of being scrapped.