The model in question is the MTH SW9 that came out last year. https://mthtrains.com/30-20466-1
I have the cow and calf units and I would to make them a little more prototypical.
1. Added a Smoke unit to both cow and calf
2. Adding an electrical tether between two engines, linking an A (powered unit to a B un-powered) to extend the electrical foot print
3. Adding/moving an electrical coupler to a un-powered B unit?
4. Weathering
I would be very happy to pay some one to do this work for me, if any one can recommend any one