There was a NS loco in Abrams yard, near Norristown Pa, that ad a frozen stuck horn blaring for more than 3 hours at 11 pm to 2:30 am
http://6abc.com/train-horn-blares-for-3-hrs-straight-in-upper-merion/3204279/
https://twitter.com/EASpalding/status/973066604601802753