By way of an update - Penmaenbach has been photographed and should be appearing in Railway Modeller this year. The stock has been getting a bit of an airing - I have a half finished US HO layout in my "shed" and I've been playing trains...
Usually a Class 60 job this is 66079 (James Nightall G.C.) arriving at Westerleigh Oil Terminal on 22 June (6B13 I think). Outgoing service also had a 66 apparently.
I have one of the Rainbow escort coaches and its very well done but just be aware the NEM pocket is slightly too high and has a stepped tension lock coupler. I've bodged my KD and it seems ok.
Chris