This is page 1057 and D1057 was Western Chieftain, incidentally.
Next: D1058 Western Nobleman...
Incidentally, if you wonder what I am wittering on about, here is D1015 Western Champion (now preserved) at Plymouth, 1975, in the absolutely deplorable state they were allowed to get in too, but which weirdly just endeared them even more to the enthusiasts, like, no doubt, the boy in the picture!
... And the same loco 50
years later.
Designed by Sir Misha Black, they were certainly striking looking, even when run down: