Re: DCC Reversers

Marcus Ammann

Hi emrldsky

Auto Reversers work like this.

The Reversing Loop is ISOLATED from the Mainline with GAPS or Isolated
Joiners in BOTH rails at BOTH ends of the Loop.

The Input to the Auto Reverser is fed from the Booster. The Output feeds the
now isolated Loop.

The train is running down the Mainline towards the Loop with the turnout set
to the route that you want. As the loco/train negotiates the selected route
and reaches the Gaps, if the polarity of the rails at the "other side of the
Gaps (the Loop), is opposite to that of the rails where the loco/train is
coming from (Mainline), then there will be a Short Circuit. The Auto
Reverser senses this short circuit and changes the polarity of the voltage
that it is feeding to the Reverse Loop. Now the short circuit is condition
has been corrected. This happens so quickly, that the momentary loss of
power was not noticed by the loco and the operator.

The same scenario happens when the loco/train exits the Reverse Loop, as

The hassle with Reverse Loops in DC has been eliminated in DCC with Auto
Reversers. Sound and Non Sound locos just keep going as nothing at all has
happened. The sound does not even hiccup.

Hope this helps


-----Original Message-----
From: WiringForDCC@... [mailto:WiringForDCC@...] On
Behalf Of emrldsky
Sent: Monday, 10 May 2010 12:14 PM
To: WiringForDCC@...
Subject: [WiringForDCC] DCC Reversers

Hi I am somewhat confused about exactly how the DCC reversers work and how
the entire layout is affected. For example, the layout is a main line with a
parallel passing siding; there is a reversing loop at each end of the main
line. There are 4 power blocks; the main line, the siding, reversing loop 1
and reversing loop 2. All block polarity switches are set to position A. On
DC, after the train enters reversing loop 1, the polarity control switch for
the main line block has to be thrown to position B so that the train will
continue on without causing a short. Likewise, if the train is to use the
siding, that switch must also be thrown to B, and the switch must be thrown
to B for reversing loop 2 just as the train is to enter the it. Then the
whole sequence must be repeated just before the train exits the reversing
loop 2. And so it goes every time the train changes direction via the
reversing loops. That works fine for one train. So, how complex does it get
for two trains? or Three, or more. The number of power blocks grow along
with the number of trains that are to be run at once.
Now comes DCC and the auto reverser. Does the entire layout, assuming it is
the same one, get its "polarity" switched back and forth? What happens for
multiple trains?


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