Jason Klocke lent me one of his Milwaukee Donkeys. We used it during an ops on my layout the other day. It's equipped with a Scale Sound Systems custom speaker. Besides listening to a 'state of the art' speaker I thought you might enjoy some freights cars in their natural habitat? Cars range from plastic, resin kit builds to partially scratch built or RTR.
https://www.youtube.com/watch?v=HGh0UyOU4GU&t=28s
CW Propst