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Dave, a wye, true or not, needs at least 3 switches.  A loop will reverse a train but it's not a wye.  My home town had 3 railroads crossing at angles and forming a triangle.  The IC ran east/west, forming the base or bottom; the Alton ran from the southwest towards Chicago in the northeast; and the Wabash ran from the southeast towards the northwest.  They formed a triangle but there was no actual wye.  (A tower on the Alton controlled the signals on the other two roads at the Alton crossings but not where the IC and Wabash crossed.)However, there were 3 interchange tracks laid out in a fashion that an engine could be turned.  A northbound Alton engine could take the interchange on the IC and move east to the Wabash. There it could head southeast on the Wabash and after cleaing the switches could back up to the Alton and head northeastward (still backing) on the Alton.  After clearing the switches, it could move forward heading southound on the Alton.  Note that the engine had to traverse 6 diffenent switches, and some of them twice! It should go without saying that IC and Wabash engines could also be turned.Springfield, Illinois, had a similar configuration where several roads were involved.Art
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