Y3/Y3a tender wheels circa 1950

[nw-modeling-list at nwhs.org]

I was recently looking at my P2K Y3/Y3a models, and noticed that they have ribbed back wheels.  Is this correct for 1950 or should I be changing them?  .  

Thank you. 
Nigel F Misso
# 0666
nfmisso at mchsi.com
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