There is merit in the DPDT switch usage especially cost, however I got the LGB things for a really good price, the isolating is done by track pieces instead of IRJ s, but the most important thing is the mental capacity remaining in my brain and the physical effort in flicking a switchI considered using that fancy diode reversing system. Read up all about it, including the voltage loss, and the fact that there would be a momentary kick when you reversed the polarity once the train was on the loop. Frankly, in the end, it was the cost (in the Colonies) of the system. Did some figuring, and installed a system that cost only $6.00, and did not get a voltage drop. Down side, the train, theoretically, has to stop when changing mainline polarity. I reckon that's OK, because a real train would have to do that if the turnout was a manual one where the crew had to bend the iron.
On the Taita Gorge, trains using the reversing loops (yes plural), enter said loop, and once completely in the loop, and just before the exit, the Direction button on my Train Engineer is pressed, the train then slows to almost a stop. There is a dwell time before it reverses (which we don't want to do). At that point, I just flick the magic $6.00 switch, and the train builds up speed and carries on its merry way. And the $6.00 solution? A DPDT switch wired up in reversing mode.
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.... and for an extra $3.00 (an on/off switch), you can even control the crossing loop! The backshunt is handy for the short loop/large train (which fits the crossing loop out the front) scenario.
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