Railthunder posted:The best starting point if you're using Atlas products is the U23B. You'll essentially need the wide radiator section at the end .....
For those folks thinking of going from a 23 to a 30/33/36 or vice versa, as I recall* the 12 cyl locos usually** had one less radiator section than their 16 cyl big brothers. I am using section here in the sense that, if you think of the radiator area when viewed from the top as being divided into four quarters, the 23's had no cores in one of the four sections. This assumes the model has a see-thru radiator screen on top, of course. I have some slides that illustrate this but am not able to quickly find them, so perhaps someone better organized than myself [ My wife might say "That would be everybody...."] can contribute an illustration.
*Because I am going from memory
**There might be exceptions -- Southern Peru Copper, for example -- and I'm not counting B30A's, etc
Regards, SZ
