Scientific Toys "Coastal Express" Train Set G-Gauge

Can anyone provide me with the directions for making the smoke for this type of train? We have mis-placed the directions that provided this information and I know it is a simple combination of ingrediants but cannot remember what they are.

Thanks for the help

The directions that came with my set says to use 3-N-1 oil. It has been around for ever and you can get it from just about any hardware, grociery, and of course WalMart.

Thank you!!!

One last question - Has anyone found a place to purchase a Tunnel that would go with this Gauge train? My son is dying for a Tunnel and I have not been able to locate one yet.