Been told Outlaw has done some Railway colours, Seen they have Indian Red but no Chrome yellow.
The trouble with Indian Red there is different shades of it, The Diesels were painted by different company's who supply the paint.
Years ago one could buy small bottles of paint to paint your Diesels but the Bloke who brought them out has passed away and you can not buy the paints, I bought some Indian Red and Chrome yellow but over the years the paint has gone dry.
Vallejo have a colour in there Model Color range, Hull Red which is close to Indian Red.
The same bloke who did the paint bought out NSWGR 45 class Diesels in all the different colour schemes and for the dark blue which is called Harbour Blue he found FORD Blaze Blue very close to the Harbour Blue, I was talking to him about the Diesels and the colours and said about the blue and what it look like the Ford colour and he told me that's what he used as it was very close, He could not get the paint code from the Railway as they did not know were it was.
That's when I bought the colours back in the late 80's and sadly Did not get a chance to buy a 45 class diesel as at the time did not have much spare money, have seen the odd one or two come up as second hand but they are badly knocked about and no one else has done the 45

one day might find one.