With the announcement of the heavily weathered National Power HKA wagons, I would like to suggest a Class 59/2 locomotive add on to go with them. This could be either in a heavily weathered NP livery as originally applied when released to traffic or a later livery of a subsequent operator. Moreover, as the Class 59 fleet is small, it might be timesaving to create the /0 & /1 variants at the same time which would add a little more opportunity for additional services on certain routes. This should be a no brainer as surely much of the existing (if heavily overused) Class 66 is near identical with only minor differences between each. As far as liveries, there were multiple since the first 59 took to the rails in 1985. I apologise as I know that this might not appeal to those sick to death of the 66 but I believe it is still a worthy (possibly easy) suggestion.
Would be interesting to see a 59 in a 1980s route. Even though the unlimited amounts of TSW Class 66 varients have caused my disliking for the class both in game and IRL, would be nice to see the 59 as it techincally is a different locomotive to the 66 but which current routes would the 59 run on from '85