When I wrote my recent series of articles on the electrical aspects of battery-electric locos (Current Affairs, EIM Nov 2020 - Feb 2021), I did wonder if they might cause the editorial mailbag to experience an obesity crisis. The articles were actually quite difficult to write, as they needed to include sufficient detail to enable 'experts' to understand the basis for my assertions (and hopefully be satisfied of their validity) but not so much detail that the average (non-electrical) reader would get lost and give up. I have received some excellent feedback (many thanks to those who wrote in), some of which shows that there is still a little confusion out there on a couple of points, at least in part due to me trying to steer clear of delving too deeply into advanced electrical theory. The purpose of this follow-up article is to try and clear up these points.
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