DPDT
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.
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DPDT
[MR] Double Pole, Double Throw. This is a special switch which is used on model railroads to allow you to change the polarity of the current for reverse loops, or complex block control.
DPU ...
- DPDT (double-pole, double throw) toggle switches for changing polarity to reversing loops and wye turn-around tracks.
- SPDT (single-pole, double throw) toggle switch to control your turntable motor - forward and reverse.
A DPDT 24 Volt DC relay and a toggle switch has been added for direction control. The direction switch, speed control potentiometer and a 10K ohm resistor are mounted in the Hand Held Controller.
Walkaround Transistor Throttle Schematic ...
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.
For use of a second message, rather than connecting the speaker directly to the module instead connect the speaker and DPDT toggle.
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.
The common method is to insulate the reverse loop at both ends, 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.
Changeover
Type of electrical switch. A single pole changeover switch is called an SPDT (single-pole double-throw) switch in North America. Likewise a double pole changeover is a DPDT (double-pole double-throw) switch.
 See also: Track, Switch, Locomotive, Layout, Train
  
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