A picture of Union Pacific no. 4000 (the engine responsible for the recording)
This sound effect was originally part of the Major Records Sound Effects Library from Valentino, but has since gone out of print after Valentino Music shut down in the early 2010s. The whistle heard in this is the Hancock 3 chime whistle of Union Pacific #4000, the first member of the Big Boy class.
Sound Effect Description
Loco No. 4000 class Union Pacific (Big Boy) approaching, pass - moderate speed
Clean, Full Length and Unedited Link to the Sound Effect
YouTube (skip to 10:10)