I can't find these switching rails in 1.12.2. It was not added or it will not be in 1.12.2? Tell me please

you need to hit the rail with a spike maul to create the turnout, wye, and junction tracks

Yes, of course, thank you ParapetCloud and chyper111. I've been playing 1.12.2 for almost a year without this rail, and I didn't think of it)

parapet's right just get ether spike maul and it will switch to the switcher or the other two.