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What are Reverse Loops?A reverse loop, sometimes called a balloon track because of its shape, allows a train to change direction without going in reverse. Wiring a reversing section, including loops like the one shown here, wyes and turntables is as easy as cutting gaps in the rails and inserting a DPDT Toggle switch wired as shown.
If your model railroad uses a conventional DC (Direct Current) power supply, adding a reverse loop is only a toggle switch away. Isolating the Reversing SectionBefore you can wire the reverse loop, it must be electrically isolated from the rest of the railroad.
Before the train can enter the loop, the toggle switch must be properly lined so that the polarity of the reverse section matches the polarity of the rest of the railroad at the entrance point. If you only use the reverse section in one direction, plan ahead and reset both switches when your train has completed its run through the track. Like conventional DC wiring, the reversing loop or track section must be electrically isolated from the rest of the railroad even with Digital Command Control (DCC).
This very large model railroad exhibition in HO scale presents the German history of railways from the beginning of the 20th century to modern times. Trains complete and end their runs in this yard and are already turned for their next departure upon arrival. Trolleys frequently use reverse loops at the ends of runs, taking advantage of their tighter turn radius.On a model railroad, as with the prototype, reverse loops consume a lot of space, but are the fastest way to turn an entire train.
This method will work with the control systems offered in most two-rail track train sets on the market today.

This can be done by inserting insulated rail joiners on each rail at each end of the reversing section.
This can be done with plastic rail joiners or simply by cutting gaps in both rails at each end of the reverse track.Reverse sections can still have their polarity flipped manually with a toggle switch with DCC.
These circuit boards detect the short circuit when a train enters or leaves a reversing section lined against it. One of the most common uses of reverse loops in modern layout design is as part of a staging yard. The same method can be used with Digital Command Control (DCC) although there are other options for these systems as well.These same steps work for loops and all other reversing track sections including wyes and turntables. The only difference is you will not need to change the direction switch on the cab as the polarity in the rails no longer determines direction of travel. The majority of two-rail track systems use a positive (+) voltage on one rail and a negative (-) on the other. Multiple feeders can be used on large reverse loops.Attach incoming power to either one of the other pairs. An added advantage of these boards is that many also act as a circuit breaker and can avoid damaging a decoder or other expensive components.Wiring the Auto-ReverseWhile there are several versions available, most automatic reverse boards are simple to install.
In an a reverse loop arrangement, the left rail will eventually touch the right rail and create a short circuit.The same rules hold true for other reversing track sections including wyes and turntables. Most varieties of readily available switches will be able to handle the voltage and amperage requirements of model trains.

This can be a connection directly from the power supply or from the power bus that feeds the rest of the layout.
Most require only attaching two input wires from the non-reversing bus and two output wires to the reversing section. Only the table itself needs to reverse polarity, selecting A or B for the end of the bridge your engine will cross.The toggle switch will reverse the polarity of the rails in the reversing section once the train is in the loop.
Some provide options to add resistors to increase sensitivity or add LED indicator lights for control panels. Each period is represented with its inherent locomotives and architecture on the four model train layouts. This is a good option if you would like to be able to turn off power to the reversing section entirely. An analog control technology is used, namely the speed controller of the Gebhardt company from Germany. Of course you can also stop the train prior to throwing the switches.It is always a good idea to leave the track turnout and the polarity switch oriented in the same direction. They were converted and optimized with special model train motors by Faulhaber company from Germany.

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