Some analysis from Frank Etzel on the audio file on Atlas' web site: >the u25b pioneered the fan blade connected via driveshaft, hence the discernible " whoosh " that rises and subsides with engine rpm, most other engines have electrical >fans actuated via thermostat ( alco incorporated this in the century series, emd in the tunnel motors ) > >there is definite valve clatter, and a hint of burbling > >I vote for the Century 424-425 ------------------------------
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