Originally Posted by Don F
Have you seen the countersink trim screws? They have a small head with a square drive. They are black, and come in two lengths that I'm aware of. You do have to be careful if using a mechanical means to drive the screws, so as not to split the ties.
Haven't seen the trim screws (though I know the benefits of square drive).
My take is this: The round "wedge" under a countersunk screw's head would tend to split wood. And trying to pre-drill and then countersink screws this size is difficult at best. The only tenable way I see is to pre-drill & countersunk track ties on a drill press using it's depth stop. And then manage the actual screw's insertion depth while attaching track to a layout.
That's why I think the pan head screws are better. They may be somewhat forgiving as the head's flat underside would press on a tie, not force it apart.
I was pleasantly surprised testing a # 1 Philips bit. It drove these small screws without any slippage.