Subwayfan12 35 #1 Posted November 26, 2012 (edited) What is that loud ringing coming from the R142A's listen through out 1:16-1:36 Edited November 26, 2012 by Subwayfan12 Quote Share this post Link to post Share on other sites
Drag0nflamez 27 #2 Posted November 26, 2012 I think it's the aircon? Quote Share this post Link to post Share on other sites
DanTheTransitMan 355 #3 Posted November 26, 2012 (edited) Traction Motor. Edited November 26, 2012 by DanTheTransitMan Quote Share this post Link to post Share on other sites
itmaybeokay 988 #4 Posted November 26, 2012 Traction Motor. I don't think he's talking about the traction motor noise. When the train is stopped there's a different solid high pitched whine. Not sure if the inverters have any load on them when the train is stopped but that could be it. Quote Share this post Link to post Share on other sites
StevenFrancis 22 #5 Posted November 26, 2012 Its just the motor when it's on, if it was the HVAC it would emit a soft hum unlike the extremely loud buzzing noise of the R142. Quote Share this post Link to post Share on other sites
Subwayfan12 35 #6 Posted November 26, 2012 I think it's the aircon? I doubt it because sometimes when the hvac is off I can still hear the ringing Quote Share this post Link to post Share on other sites
Kamen Rider 1,850 #7 Posted November 27, 2012 it sound like mic feedback. Quote Share this post Link to post Share on other sites
6 Lexington Ave 236 #8 Posted November 27, 2012 (edited) If you go under the el on the pelham and the train is standing above you, you hear this same sound. Edited November 27, 2012 by 6 Lexington Ave Quote Share this post Link to post Share on other sites
