DPDT Switch : A double-pole changeover switch. Used on reversing loops and triangular junctions.
Dropper Wire : Feed wires soldered to the side or base of the rail and which then pass beneath the baseboard.
-Each Atlas Twin switch has 2 DPDT switches. These are used primarily for wiring reversing loops and wye tracks. For example, you can hook the main line tracks to one switch and the reverse loop section of track to the other switch.
As a train approaches the loop, change the DPDT switch for the reversing loop so it is the same as the mainline one. While the locomotive is completely on the reversing loop, switch the DPDT switch for the mainline, to correct the polarities.
Double-pole, double-throw. Switch used on model railroads to allow you to change the polarity of the current for reverse loops or for complex block control. Some DPDT switches have a "center-off" feature.
Draft gear ...
system for model railways in which two separate power sources (controllers) are connected to the track with one rail in common and the other switched between the two sources. Saves on wire and also means you can use SPDT switches and not DPDT ...
run separate feeder wires from the power pack to the loop, and install a double-pole, double-throw (DPDT) toggle switch between the power pack and the non-loop feeder wires. While the train is in the reverse loop, you would throw the DPDT switch to ...
This way it will not interfere with any other system already in place, and you don't run the risk later of having equipment moving around when you don't want it to. This is easily accomplished by using either SPST or DPDT switches to turn power on ...
 See also: Track, DPDT, Block, Switch, Locomotive
  
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