The loco, a Bachmann V2, was "done up" to match the kit built stuff about 7 years ago. Unfortunately I cannot give you exact detail of the parts used as they were from the infamous "scrap-box/spares trays" which often feature in articles. The parts used in these said articles never seem to be mine!!
However, I had a few close up shots of 60813 and worked by eye rather than using exact measurements. I used part of the centre piece of a whitemetal chimney which by my reckoning looked the right radius and used spare etching, from memory, from a W.D. 2-10-0 kit cut to shape, once again making it up as I went along.