I think the red cab panels were both a lovely touch and a missed opportunity, given they weren't adopted. Taken me a number of years but I finally 'get' blue now.
Saw it on the WR with the XP64 set back in the day when we were searching out the last GW steam at Old Oak Southhall and many more plus of course the obligatory pilgrimage to Barry docks.
I was a schoolboy then but Jeez..am I really that old?