I believe it was stated in a previous post this was a RR shop mod,GM did not deliver the FTs with vents in the doors. the cause of all the reaction to this thread was the original poster stating this was a mistake by the importers when in reality it was a later mod by the RRs that the importers choose not to include on the models they imported . . .
Ah, we're back to reasonable discussion. Let's stay there, please.
By the way, I have studied Santa Fe engines and their details for over 60 years -- even seen rednose passenger FT's up close -- and I had never noticed the door vents until they were pointed out in John McCall's Warbonnet article. A tip of my hat to Brother McCall.