This is a decoder install in the first generation (1988) N scale Atlas RS-1 that was made by Kato. I'll put a Digitrax DZ126T decoder in the loco. A somewhat easier install can be undertaken by using a TCS CN decoder that inserts where the light boards normally are. It costs about half again as much but there is less milling to be done and less wiring needed. If you go that route look at this link ( HERE ) as I think it pretty much eliminates much of the milling as the light boards are reversed in position. This will require you to change the normal direction of travel when you program the loco depending if you want the cab end to run first or not. I have the install on my web site ( http://1fatgmc.com/RailRoad/Decoder-1/page-4.html ). There are over 25 pictures and written info there, so too much to put here. I'll put some of the pictures up here and you have the option of going there for more in the way of pictures and info. With a multimeter check several things before putting the loco on the track. 1. There should be no continuity between the frame half’s. 2. If you check between the motor caps (orange and gray wires) there should be no continuity between them and either frame half. Between the two measuring through the motor you should see an ohm reading. With this motor it was about 24 ohms. 3. If you touch the red or black wire where it is soldered to the lightboard and check continuity between it and the frame half on that side you should see continuity. I check from there down to each wheel on the same side of the frame and that tells if the continuity from the rail up to the frame and on to the decoder is good. If any of the above don't check out fix it before putting the loco on a powered track. I smoked one decoder recently by not checking. Luckily it was a $12 China one. Again much more info here.... http://1fatgmc.com/RailRoad/Decoder-1/page-4.html Sumner
I have a video up showing how easy it is to use the rotary cutter to mill a frame here... Between it and using a good jewelers saw you can modify a frame for a decoder install in 30-45 minutes and you might already have the tools or if you need to buy them they are around $50 total and can be used on other jobs, Sumner
