[snip] it was not permitted to wear any yellow, red or green clothing which could've been mistaken for signal flags, so this is another reason for orange - it's not a signal colour.[snip]
I remember turning up at Witham 'box for late turn, to relieve Adrian Vaughan. There were visitors - Adrian introduced me to railway photographer par exellence Ivo Peters, who was with a friend of his wearing the brightest reddest shirt I'd ever seen. Idiot me was far more concerned with the redness of the shirt than I was in chatting to the great photographer. My loss. If his reputation meant anything, I guess Ivo would have stayed and chatted; he befriended many railwaymen. Some of the pictures taken by ivo that day are in his book, "Railway Elegance", which I greatly recommend to all who appreciate semaphore signalling and D1000 locos.