When this http://www.roblox.com/Tram-Engine-Loop-item?id=155453740 sound is looped in-game inside of a part, there’s an annoying… something high pitched, cant really describe it as its not very screech like… at the start of each loop. However that is not part of the sound. Here is the sound as it appears on the site:
http://www.roblox.com/Tram-Engine-Loop-item?id=155453740
Just to prove its not in the original sound, I trimmed the start and end and reuploaded it:
http://www.roblox.com/Tram-Engine-Loop-Retrimmed-item?id=155454346