Does the rail have some flexibility to twist and meet the wheel cone at the right angle, and/or is it pitched to match the angle of the wheel surface? When I lo

Does the rail have some flexibility to twist and meet the wheel cone at the right angle, and/or is it pitched to match the angle of the wheel surface? When I look at the tracks and this wheel shape, I see the wheel riding on a corner of the rail, which is obviously not the case.