I have to wonder especially if they are of less diameter/cross section than an elastic railspike and are screwed into a hole, split, rot or sawdust. There are screw spikes and there are screw spikes too!The North East SG all over again.
I said on day one and several times since that we would make a balls of the project!
As much as I call out the ARTC for doing a poor job. In no way did they ever use screws to hold rail to a sleeper. This is beyond a joke if this is the case and surely some criminal charges should arise.
The bolts used would likely hold it in better and for longer than a completely unthreaded dog spike...
See the Weekly Times pictures elsewhere here on RP. I don't seem able to link to them.
Remember; If the job's worth doing it's worth doing on the cheap.