"Can anyone confirm that such systems are still in operation ? "
Not only are they still in operation, but plans are in the works, to expand DC projects.
Here is one example:
http://www.neptunerts.com/data/downloads/Handout%20-%20PROJECT%20OVERVIEW.pdf My DC Motors & Control Class, would always say, on the first day of class, i am wasting my time here, but i have to take this class, as the class came to a years end, i would hear, i never knew, there was so much run by DC.
