Merry Christmas, Everyone
Here is a train of thought for under the tree:
Oscar Nattochdag = Chattanooga Cars
I'm not sure what to make of it in Pale Fire, except as autobiographical clue; Nabokov apparently loved trains. He always drew on on letters for young Dmitri and Dmitri left a bunch of model trains amongst his donation to Harvard.
Kinbote is very fond of Nattochdag, so maybe that is the link.
The extremely popular song, "Chattanooga Choo Choo" came out in 1941 with the Glenn Miller Orchestra:
"Chattanooga Choo Choo" is a 1941 song written by Mack Gordon and composed by Harry Warren. It was originally recorded as a big-band/swing tune by Glenn Miller and His Orchestra and featured in the 1941 movie Sun Valley Serenade. It was the first song to receive a gold record, presented by RCA Victorin 1942, for sales of 1.2 million copies.
For what it's worth "Night and Day" by Cole Porter was a big hit in 1946