Analog loop reversing relay - Model Railroader Magazine

Dave K

I do not want to complicate thing with a bridge rectifier.  Just want to use a transformer and a twin switch for polarity reversal.

If you do not have the rectifier you will need to either stop the train in the reversing section, or flip the direction switch on the power pack and the DPDT to the reversing section simultaneously.

The reason for the rectifier is to allow the DPDT reversing switch to control the reverse section independent of the controller direction position. As the train goes through the reversing section the direction switch on the controller can be flipped without affecting the direction of the train in the reversing section.

This is simpler to control, which is a preference for me.

You would need a separate DPDT switch for each reverse section, but they could be supplied by the same rectifier.

When I build my layouts, I am OK with complicated builds in exchange for simple operation. You might hear the phrase "With DCC you control the train, but with DC you control the track", but, that does not need to be true.

I do not control the track, just the turnouts, which you need to do with DCC as well. The turnout position controls cab selection, signalling, isolation, and power routing.

As described previously, my reverse section has industries on it. All trains must stop and either pick up or drop off a freight car. The first direction change is done with the reverse section DPDT reversing switch. This makes control through the reversing section almost invisible.

There are almost no electrical controls on my panels other than turnout toggles. However, it is more difficult to build this way.

Reading about the Atlas Twin (which I have never used) it is supposedly just two DPDT reversing switches (not center-off) in a plastic housing. It is priced higher than a pair of DPDT Center Off Toggle switches, so I will never use one.

From how it looks to me... you could feed the Atlas Twin from the DC terminals on the recitifer, and use each side of the Atlas Twin to control a reversing section. Someone familiar with the Atlas products will need to verify that this is correct.

Also, another detail I am not sure about, but if the Atlas Twin is not "break before make", I would never consider using it.

-Kevin