I was thinking of the Sierra Railroad in particular when I posted about a wye or balloon track. The Sierra resisted dieselizing for a long time after all other railroads had dieselized. One thing they did was to purchase a used 2-6-6-2 articulated from a logging company to use for mainline power. Their turntable in Jamestown wasn't nearly big enough to turn it, but they had a wye there. It may have been that they had the wye before the articulated, so they just used it to turn the articulated locomotive instead of spending the money to build a larger turntable.