My DeFever 40, Costa Mesa built, had the come home feature installed - genset powered pump, hyd motor mounted above the shaft, and a clutched chain drive to the shaft.
I took it out. Junked it.
The thought of the thirty year old hydraulics and ten gallons of oil circulating in my engine room scared me. What a mess if it leaked.
The two previous owners of the boat had never used it.
If you think that there is any comparison between a diesel electric locomotive and the Downeast get home system, well, best of luck to you.