I have found a colour photograph of 5410 on Southall shed, 27/9/59 in lined green livery with black pannier tank ends (Locomotives Illustrated 140 Front Cover, Nov-Dec 2001). It had just returned from a general overhaul from Caerphilly Works. The same photograph in black and white appears in the Irwell Press Pannier Papers No.7 on page 11. 5410 has a polished brass safety valve cover whereas 6412 is painted green. Colour photographs of 6433 (lined green, black pannier fronts) also feature in Western Branch Lines by David Soggee and Michael Welch, Capital Transport of page 71 although the difference between green and black in the more distant view is difficult to discern IMHO.