Posted by BN-SF on January 23, 2023 
ATSF didn't have Tunnelmotors.
Posted by Jonathan S. Spurlock on January 23, 2023 
I don't see any tunnel motors on any of these units. That SD45 in number 4 position still has those flared or "Hammerhead" radiators, as some call them, and the other three all have solid rear sections as far as I can tell. I do remember some chatter from the mid-80's that SPSF also meant "Shouldn't Paint So Fast"!
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