In recent videos I’ve noticed how PM 1225 has a screw reverser, and NKP 765 has one on a leaver or the style that seems to be the unofficial US ‘standard’. With a little bit of reading, the way I understand it is that 765 at one time may have been an odd ball on the NKP, as the class was ordered with the screw style and later on 765 was refitted with the leaver so make for easier switching. Would this mean that say the(NKP) 757 or 759 have retained the screw style? I’ve also read about modifications to the screw style, as in air operated valves to turn them faster than the hand wheel would. Does anyone here have experience with this they could share? Pros & Cons?
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