This is a Rectify Series drop-in speaker system for Rivarossi U25/28C locomotives. The speaker mounts in the factory cavity with no modifications needed, though the stock speaker frame-half will need to be left off. A touch of adhesive secures both the speaker and the headlight bracket.
 
Use alone or in concert with the UFIT-7235-087 mounted in the rear.
 
The speaker comes fully assembled and tested.
 
VIDEO: https://youtu.be/GOqUkcGpx9Q