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The Atlas #5 has a longer than normal lead.  According to NMRA RP-12.25 a #5 switch curved rail should have a 48.385" radius, so add 0.625 for the center line and it should be just about 49" .  Apparently Atlas has stretched the lead by about a 1/2" which yields a nominal 63ish inch radius (a #6 should have a 74 inch radius curved rail) .

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  • RP-12.25
Last edited by Jim Scorse

Jim,  Are you aware of the radius of  the Atlas wye? 

All my T-1 engines (different mfg.) go through the #5 turnouts but they all climb the rails on the wyes.

Brad at Signature Switch can make a replacement wye with a more generous radius for the restrictive Atlas wye and still fit within the foot print of the Atlas wye due to the over length of the Atlas wye.

Tom Tee posted:

Jim,  Are you aware of the radius of  the Atlas wye? 

All my T-1 engines (different mfg.) go through the #5 turnouts but they all climb the rails on the wyes.

Brad at Signature Switch can make a replacement wye with a more generous radius for the restrictive Atlas wye and still fit within the foot print of the Atlas wye due to the over length of the Atlas wye.

Tom, yes I am familiar with the Atlas wye and its relatively small radius.  I can just sneak 80 foot observation cars through it to the turntable.  I should have tested before cutting lumber and committing to the track plan.

On the other hand it is pretty useful in industrial areas.

Last edited by Jim Scorse

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Ste 6, Mountain Home, AR 72653
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