Hi Mike,
Many Thanks for the 'educational' reply, which was very helpful as ever.
Just like to point out that I got 135 tons from the GE Builders plate on the Loco, which states 135 METRIC TONNES........however as you say, the TOPS data panel clearly says 129 TONNES, so straight away, a difference.
Also, the co-co bogie is an obvious difference between the 67 and 70, so of course, more weight distribution, enabling the RA of 7.
I knew that the 'official' figures/design couldnt be wrong, but the 135 tonnes did get me wondering.
Thanks again,
Dave