MAGNETIC SCREW HOLDER

I don't think so. Motors and speakers have magnets, and they're fine. You need to watch out for electro-static discharge more than magnetism.

When I'm in doubt about using a magnetic driver, I use a little dab of lithium or vaseline on the tip of the driver to hold the screw in place.  Works well for small screws used in modeling, not so much in automotive, with heavy screws, but it can still work.  Just need more stickum'.

I have been using Quick Wedge screw holding screwdrivers for many years. They come in assorted sizes.

Most hobby shops have a spring loaded screw holder that has three or four "fingers" that grip the screw head and is released when the top of the holder is pushed down to spread the "fingers" apart

I magnetize all my small screwdrivers by just stroking them with a big neodymium magnet. This is one of a set of inexpensive ones that were unmagnetized when I got them.  Magnets like this won't damage boards, etc.: at least not if your remove them from nearby before you power them up again. 

I do as Lee does with one of these (similar to it, but different brand) that I got at Ace hardware for about $3 or so, I think that's all it was anyway. I have tried a couple of the holding screwdrivers, but found them awkward to use, at least they are for me anyway. I would prefer one of those, but I guess I just can't get the hang of it.

I've had one of those for years, made by Snap-ON. Works great.

Thank you all for responding. now I know what I'am looking for.

I know of no electronic circuits in our trains that would be damaged by magnetism, that's not a factor at all.

I do the magnetize trick as well, I have a large magnet that I just stroke the drivers on when they lose their grip.  If I need to use one without magnetism, I just use the old VCR tape eraser to demagnetize it.  The old VCR tape eraser works great on steel track to demagnetize it as well.