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Hello , I 'm really going to show my stupidity but here goes - Is block wiring even necessary when using lion chief plus or legacy control ? Other than parking engines somewhere so they don't sit with 18vac on them , what am I missing ? I don't have any conventional engines any more , but I suppose they would run off a transformer as the layout would be essentially one block. Go easy on me and thanks for any help !

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Blocking of course for sidings and spurs that can be toggled off for parked locos/cars/consists as you already said.   

But I believe isolated blocks can also be useful for diagnosing or trageting shorts or other track/operational issues depending on the size of your layout, even when running 18 volts constant for LC+ or similar operation.

Is it mandatory - no, but it can be beneficial, even assuming that you have multiple power feeds to the track and no voltage loss at any point on the layout.

As you stated, it can isolate sidings. That means less electric usage and lower electric bills. In addition, some MTH engines track hours of usage and just sitting on a powered track will increase the hours, even without the train running.

In addition, it can allow you to run two trains at once, especially if you use block detection wiring. 

It will also make it easier to find electrical issues if they come up (and they eventually will).

Finally, some systems, like DCS recommend block wiring to assist with optimum signal reception.

These are just some of the benefits.

 

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