When creating and experimenting with BULLFROG SNOT, we noted that different locos react with various results to applications. There are ‘suspension’ variables that mean certain wheels will get more ‘bite’ that others. There are also torque effects that were previously not a concern to us that will cause one axle to have more traction. And it can be direction dependent.

We’ve applied BULLFROG SNOT to a loco and had very little improvement, but when moved to another axle on the same loco we witnessed dramatic increases in pulling ability. From our experience, applications to more than one axle per engine reduced electrical contact. While one axle per engine did not have harmful effect on pickup and provided adequate traction. Diesels seem to like the rear set of driving wheels SNOT’d.

Exceptions abound. Steamers with good tender pick-up can use multiple traction tires. Our 2-10-2 has BULLFROG SNOT on three of the five axles. Our Spectrum 2-8-0 and 4-8-2 have BULLFROG SNOT on two of the four, and our MP 4-4-0 uses BULLFROG SNOT on all drivers (We do use a modified tender for more reliable juice). For the 2-6-6-2 and 2-8-8-2 engines, we applied BULLFROG SNOT to the crank mains with excellent results.

So the word is EXPERIMENT! BULLFROG SNOT is easily applied, and easily removed, with no permanent changes to your locos. We know it works great for N, and have reports that HO and O scalers are liking their results as well.