She's already made a sneaky entrance on the Love Lane thread care of Mick, so here's 46448's curtain call before she heads for a little Essex branch line in Oz.
It's a Finescale Brass offering in 0F which came to me ready painted and lined, but needed the standard chimney replaced by one of Darlington's tall and skinny jobs for which I couldn't find a drawing anywhere.
I had several photos of this and sister engines, but the camera angles always seemed to play tricks, and it was difficult to capture the exact shape. I even resorted to measuring up a 4mm one from Comet, just to get some sort of base line, and looked at old drawings NER chimneys built by Darlington to get a feel for the sort of shapes the Works used to produce.
In the end I threw lots of dimensions and sketches at John Birch who played around with using his 3D CAD package, and overlaying it on photos it was like, 'bit more of a taper here, bit more of a flare there...' until it looked right from as many angles as possible. The file was sent to Shapeways and through the letterbox dropped three 3D printed chimneys (just in case I ever have to do another!)
Of course all the engineers are now staring at the floor, holding their heads in their hands and muttering profanities into their beards, but as I've said elsewhere, I'm not really an engineer and if it looks right...