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Hi Hens Ow welcome to the forum


Reverse loops wye junctions or turntables can need a reverse module fitting in to handle the polarity of the track more reading with diagrams is here http://www.wiringfordcc.com/track_2.htm#a45 or use the search facility on the forum in the top left of any page.
 

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QUOTE (Hens_ow @ 8 Dec 2008, 17:14) <{POST_SNAPBACK}>What do reverse loop units such as Horndy Reverse Loop Module do with a switch dose't

You can use a manual switch for a reverse loop but you have to stop the train to reverse the switch position. Using a reverse loop module not only means you don't have to stop the train it means the operation is carried out automatically.
 

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Strictly speaking you don't have to stop the train when you throw the switch, but you'd have to throw the switch when the whole train was in the reversing section otherwise there would be a short circuit.
 

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QUOTE (Brian Considine @ 8 Dec 2008, 18:40) <{POST_SNAPBACK}>You can use a manual switch for a reverse loop but you have to stop the train to reverse the switch position. Using a reverse loop module not only means you don't have to stop the train it means the operation is carried out automatically.
You're thinking of analogue (DC) operation where the polarity reversal means you have to stop the train and reverse the controller to stop the train shooting off backwards.

For DCC, there is no need to stop the train, indeed, automatic units do not do so.

A "semi-automatic" way to control a reverse loop is to have the polarity switch operated from the point setting at the entry to the loop.

The problem with switches is the speed of operation, especially with sound fitted locos which may reset and go through the startup sequence again. This can often be disabled through a CV.

Andrew
 
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