c.sam, the RS3 was my 1st O gauge engine. I had it a few years before I ever dreamed of having a layout. It was the 1st O gauge anything I had seen lettered for Seaboard and had to have it.
I have been most pleased with it, even the Locosounds were nice, but I already had the ERR Cruise Commander and with the new Railsounds unit out I decided to upgrade the RS3 to Command Control.
I had already fixed the pilot and added Kadee couplers, and after looking at my books last night I see the SAL units had a number board, as well as marker lights, on the front of the long nose (SAL front end).
I think I'll Dremel out the side number boards and add the nose number board, I may even have some marker lights I can use, just not sure if I can match the MTH paint. It's a greenish brown/brownish green and none of the Pullman or Seaboard greens I have are close.