Strangely enough I have used auto frogs for a long time always on analogue, the previous layout was American, using the usual, Athearn, Kato, Bachmann mix etc.
I built this new layout and until today operated it modern image with the usual Hornby, Heljan, Bachmann mix of diesels.
Until today, I decided to get out some locos which had been stored for a long while, starting with the Bachmann, 45xx and ivatt 2-6-2T and this is where the problem came to light.
Looks like I shall have readdress the thinking on points, i do not like just relying g a the blade contact for power, suppose i will have to look at mechanical switching of the polarity.