N&W power, which ones

My DC layout is heavy on motive power, probably over thirty. Several GP 9 & GP 18 but short on non EMD and 6 axel. To thin them out I want to “set the era to 1965” on the N&W. My question is, what sources are there to guide me in selecting motive power that would have been on the N&W in 1964 to 1966, especially if they were recent purchaces that may have been in original paint?

I have found RailPictureNet and and a couple other sources but could use more help. I figure some of my favorites that fit the era but N&W don’t have will be power for Southern Traction & Power which is my fictional RR .

Thanks jerrold

I remember seeing brand new N&W SD35s in '65.

This may help you since the dates is shown.

http://nwry.railfan.net/roster.html

Not exactly what you want, but: http://en.wikipedia.org/wiki/List_of_Norfolk_and_Western_Railway_locomotives#Diesel_locomotives_acquired_through_1964_mergers

Also might find some info here: http://www.nwhs.org/archivesdb/rollingstock.php?RRSelect=N%26W+Rwy&CatSelect=Locomotive&TypeSelect=Diesel&Directions=True