This is a Rectify Series drop-in speaker system for early-run Atlas Master Dash 8-40C locomotives. The speaker is a beautiful fit between the front weight and motor mount and uses a touch of adhesive on the feet to secure it to the frame. No frame/weight/shell modifications are needed! The factory PCB will need to be removed with a hardwire decoder installation.
 
The speaker comes fully assembled and tested.
 
VIDEO: https://youtu.be/a6khomoPjSE