Mal Ferrell is wrong on this one. The tender is the same as before the Worlds Fair but was reskinned to have a nice side with a vertical top and no patches. I don't have proof of this on paper but if you look at the rivet patterns inside the coal bunker you can see where it was spliced. Also if you look at the tender before '49 you can see that the long rear deck is present even then helping prove that the loco didn't get a new tender just a new skin on the old one.
Mal Ferrell is wrong about 278's tender too, it had it long before '39, also it was a standard C class tender and several other C-16's had one like it. I think that I saw a picture of 278 with its current tender around 1910(?). Other than this the articles have been great, a good history of the C-16's.
Paul