H-mm. Well, unfortunately, this assertion appears to be too good to be true. I passed on this information to Preston Cook, and his reply is as follows:
No, they are not 201's, they appear to be Model 248 which was also used in Navy submarines. The shot is kind of dark and a tight angle but the four pipes along the side are the giveaway. Later model 278A had three. A Model 248 is shown on this page on the TES website, it is the engine at the bottom of the page after the 278A illustrations:
Just how the sound of these engines would relate to the sounds of a 201 would be somewhat of a crapshoot inasmuch as few still living would either have lived long enough ago to recall them, or to accurately and critically describe them (I am one of them, and I have only the vaguest recall as to how they sounded trackside, particularly as they may have related to other prime movers at the time). The abilities of humans to accurately recall sounds is pretty limited, and profoundly subjective.
Now, probably the more useful method to just the QSI sound file would be to compare it to the SILVER STREAK recording inasmuch as most fundamental sound characteristics are should be independent of recording quality.
In the end, however, WHO will know the difference?
Denny S. Anspach MD Sacramento
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