Sound of CPRR steam whistles

From: "Malcolm Easton" mceaston@sbcglobal.net

Is there any information about the type of steam whistle used on CPRR trains around 1885? I am trying to find a description of the sound, e.g., a particular note or chord. I see in Wikipedia a detailed discussion of this with references to other railroad lines but none to CPRR. ...

—Malcolm Easton