My current HO locomotive roster is comprised of several Athearn “blue box” units from the early 90′s, four SD40-2s, one FP45 (all but one ATSF and one BN) and one newer “DCC-ready” GP50 decorated for the CNW. I had purchased an inexpensive Bachmann DCC decoder at a train show and noticed it had the 8 pin plug that should plug into my DCC-ready locomotive. It turns out “DCC-ready” means slightly different things depending on the manufacturer. In Athearn’s case, it meant it had a 9 pin adapter board that you could plug directly into with a 9 pin wiring harness and a spot on the board where you could solder in the 8 pin plug.
Now I will admit that is certainly ready for DCC, but plug and play it’s not. I’m fairly sure with my soldering skills and a good pencil tip I could tin the contacts and solder it in, but I was wondering what other options I might have. In that it’s a newer locomotive and should perform a little better than my now twenty year old units, I determined I would obtain a good multifunction sound decoder and speaker. Digitrax makes a nice combo unit for not a lot of money and I could get it with a 9 pin harness to just connect in, mount the speaker, and possibly do something with the lighting.
That left me with a few older Athearns and a decoder that wouldn’t plug into anything. Solution? Wire cutters and solder of course! Several good articles online exist (along with several YouTube videos) of people installing DCC decoders into the good old blue boxes. I had done some tune ups on the units way back in the 90′s when I was a member of a railroad club and the guys had shown me the ropes of how to get a bit better performance out of them. “Throw out that long piece of metal first!” was their best advice and replace it with soldered jumpers to connect the motor to the truck contacts. Adding in the DCC decoder was almost trivial and I chuckled as I finished it up in about 20 minutes. Isolate the motor housing from the frame, solder one lead (gray) to the bottom contact, solder the orange lead to the top, replace my two red wire jumpers to the motor from the trucks with a single jumper between the truck contacts and solder the red lead from the decoder to the front truck. I then soldered the black lead to the front frame strut below the headlight mount. The better way to do this is to drill and tap a hole for a small screw in the frame and solder the wire to it. Done! Put it on the test track, set my DCC handset to unit “03″, give it a bit of throttle, and it’s alive! I need to go back through and tear apart the gearboxes and clean everything and apply a bit of grease but it wasn’t hard. Lighting and sound will be a bit more complicated, but it’s just basic electronics. It is certainly a good way to learn your way around the inside of one of your locomotives and a fairly painless way to explore electronics.
DCC is certainly one of the most revolutionary things about the hobby in the last twenty years. Having watched a HO EMD consist growl by on a hill with prime mover sounds and the horn blowing approaching a grade crossing was a revelatory experience. I can’t remember the last time I simply stood at a layout and said “whoa!” I look forward to doing much more with it, and my computer engineering background is making me drool at the thought of DCC-controlled turnouts, signaling, block occupancy, and computer control via JMRI.
I just need to stop reading about all of this at bedtime. My brain won’t let me sleep by constantly working out “what if” problems!