Set your font to monospaced to read the diagrams more easily.
Main rev.^ switch-> rev. loop rev. switch > rev. loop or T/T
|> rest of layout
1) with single booster:
Comm. station -> DCC bus (booster) -> aut. rev. unit -> rev loop or t/t
|-> main layout/power district
2) with two boosters
Comm. station -> DCC bus (booster) A -> main layout/power district
|-> DCC bus (booster) B > rev. loop or t/t
A rev. loop changes the loco's direction from "eastbound" to
"westbound". A t/t changes the lcoo's direction from "inbound" to
"outbound." In either case, it will still move "forward."
For an oval main line, it's easier to think in terms of "clockwise" and
"counter clockwise". ****
NB that on a DC layout, it's easiest to wire the t/t itself to act as
the reversing switch. I'm not sure if this will work with DCC.
*** To reverse the train's direction on a reverse loop, set both rev.
switches to east- or westbound, as the case may be. While the train is
in the rev. loop, set the main rev. switch to west- or eastbound, as the
case may be. BTW, there are detection and relay circuits that will do
**** Because the typical 4x8 is operated from outside the loop, the
inside rail of an oval is the "North rail" (or grouNd), and the outside
rail is "South rail" (or hot/power rail.) These designations matter when
A train travelling counter clockwise will pass from west to east on the
front track of the layout, so eastbound = counter clockwise, and
westbound = clockwise on such layouts. But of course you are free to
designate east- and westbound according to your operating needs.
A reversing loop will connect an S,N to N,S where it rejoins the main
line, which causes a short. So you must gap both rails at each end of a
reverse loop. The track between the gaps is the actual reversing section.
If you trace the N,S rails on your track plan, and find that at some
point an N connects to an S, or vice versa, you must gap both rails, and
trace back to some convenient point to put in the other pair of gaps.
This section of track will be a reversing section, whether or not it
loops back. It must be at least long enough to hold your largest engine
or consist. The gapping must be done regardless of the control system
It's possible to create reversing sections without realising it, so
study your track plan carefully. Watch for cut-off tracks, or crossovers
between main lines that are parallel for a short stretch, and so on. It
helps to run an imaginary train over all possible routes. (Some layout
design programs include this facility.) If you find that you are passing
some point in the opposite direction, you passed over a reversing
section somewhere. I speak from experience: I've designed some fairly
large layouts in my time, and have occasionally found unexpected
Feed the reverse controller from the same booster which is feeding all
the other turntable tracks. Then feed the output of the reverser just
to the turntable table itself.
That is all...
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