Hi everyone!
A few months ago, on my daily railfan trip to Nampa, I heard a very strange sound coming from the rear traction motors of UP SD70ACe #8673. You can hear this sound at around 7:30 on this video: https://youtu.be/qCqjw-l2hoo . Listen for that "wuwuwuwuwuwuwuwu" sound. In my opinion, I think it might be some sort of problem with one of the traction motors or something. To this day and every day prior to December 5, 2015, I have not heard that sound coming from a locomotive.
A few months ago, on my daily railfan trip to Nampa, I heard a very strange sound coming from the rear traction motors of UP SD70ACe #8673. You can hear this sound at around 7:30 on this video: https://youtu.be/qCqjw-l2hoo . Listen for that "wuwuwuwuwuwuwuwu" sound. In my opinion, I think it might be some sort of problem with one of the traction motors or something. To this day and every day prior to December 5, 2015, I have not heard that sound coming from a locomotive.