In the total absence of any further evidence to support various claims concerning the Cauvas NGC, I see absolutely no point in standing back any longer and I therefore feel entitled to re-enter the fray and speak as I find.
I know this thread is not about Book 3 but I am making every effort to avoid speculative news in its pages and to that end I will avoid any mention of 8MW cabs until I know for certain their relevance. Furthermore, in pursuit of actual (as opposed to speculative) news of the Cauvas NGC for the benefit of future transport historians, all I can safely say about it at this point in time, is this:
Their 4x2 unit later appeared in 6x4 configuration so it was either converted to 6x4 or its cab and identity passed to a donor non-NGC 6x4 chassis.
Robert