Thanks Garth - that is instructive compared to what I was able to do taking proportions and known measurements off photos and other sources.
This dome diameter issue is not as easy as I'd like.
Tonight I worked through 8 sources to get a sense of the variation. Using callipers and peering into the shadows of photos I measured the tank diameter at the centre line of the domes, and then the dome diameter. It is an imprecise approach, but the only one I have. Here are the results:
CP 389593 is approx. - 50 3/4"
F&C model is approx. - 44 1/2"
CP 89647 (pre re-numbering) is approx. - 44 1/4"
Type 7/11 p.219 Kaminski "Tank Cars" - approx. 47 2/3" (but drawings without measurements can't be trusted!)
CP 300901 is approx - 44"
CP 300900 is approx. - 47.87"
CP 389489 is approx - 49"
CP 89717 (pre re-numbering) is approx. 45 1/3"
Lots of room for error in these measurements. I suppose I could assume 44" or 47" is correct.
