开云体育

Hi Paul

It depends on whether your sections of track that need voltage polarity
reversing, enter and exit by the same turnout or different turnouts.

For a section that enters and exits the same turnout, I call this a reverse
loop. For a section that enters and exits by DIFFERENT turnouts, I call this
a return loop.

Auto reversers are expensive, so for the "reverse loop" I use a DPST (double
pole single through) switch or a relay that is connected to the operating
throw bar of a turnout. The train enters the reverse loop and to exit the
reverse loop you will have to operate the turnout. This is normal. Operating
the turnout will also operate the switch/relay that will change the polarity
of the track voltage. The train will continue as if nothing happened.

So for a loop that is used for changing the direction of the train a switch
will achieve the same as an auto reverser.

The "return loop" is a different proposition due to the layout construction.
The return loop may be at the end of a yard where either the yard or the
return loop voltage polarity has to be reversed. This can only be done
automatically and easily by using an Auto reverser.

Turntables are another example where an auto reverser and not a switch must
be used.

More information can be obtained by reading Allan's "Wiring for DCC" at:



Marcus