I believe that this is what you're looking for:
I'm joining some LGB track to AristoCraft track using Aristo's track
> screws, so I'm going to need some extras. Unfortunately, my local
> dealer can't seem to order these screws (he keeps ending up with the
> screws that hold the track to the ties, not the screws that holds the > rails together).
>
> Does anyone know the actual screw size, the drill size for the hole,
> and the tap size so I can tap the holes? It will save me a lot of > grief...
>
> Thanks!
>
> Arthur Ross