London North Eastern Railway K4 Steam Locomotive Whistle "Doppler effect" Patch (Created by Logan Butt)

Union Pacific Big Boy Whistle Enhancement (Originally created by Joey Condrey)

Robinson 04 Steam Enhancement Pack

BR Standard 2MT Steam Enhancement Pack

LNER/BR A4 Steam Enhancement Pack Update 

British Railways Thompson B1 Whistle Pack (Made by Glenn Streeter)

LNER/BR A4 Modified Whistle Pack  (Made by Glenn Streeter)