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Hi Ian,

Having looked at the illustrations on the web page you mention, I have a couple of comments:

The uppermost illustration is confusing in that it does not show both rails. To which rail should the single diode be soldered? (I think it should be the right rail in the direction of travel). Should the other rail be isolated at this point? (I think not)

I would also query the lower illustration. Notice that two of the diodes point North West. I think it would work if these were to point South East. This would ensure that one rail of section B always gets positive current and the other rail always gets negative.

The trade off is that trains in section B will never be able to reverse. Whichever way the reversing switch is set, they will only ever go forward (or stop).

The above comments are based on theory alone, let me know if it works in real life.

Regards

RightAway
 

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Yes Gary, excellent link.


A two-rail diagram is so much more useful. You could possibly get away with using a single diode on the exit section, but for the price of a diode, using two as shown makes the process easier to understand.

Regards

RightAway
 
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