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<p>Idealy the train is shorter than an auto reversing section,  however this is not always possible.  In the situation with the wye, your train will most likely be longer than the reversing section, unless you are using the wye only for locomotives.  In any case the reversing section <span style="text-decoration:underline;">must be</span> longer than your longest locomotive to prevent your locomotive from shorting out by touching both sides of the mismatch that required the installation of the reverser.   I would go so far as to say that a good rule of thumb for minimum length would be to have your reversing section longer than your longest consist as a minimum.  The PSX-AR and AR-1 are both good products and either should work for you.</p>
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