I have a MP 4-4-0, modified with better tender pick-up. With BULLFROG SNOT on all four drive wheels, it pulls great. 25 cars on the flat and 8 to 10 cars up hill. It looks great with mixed trains, shorty Bachmann passenger cars, OB wooden boxcars riding on archbar trucks, and a four wheel bobber caboose.

Trouble is, it would still stall while passing over a Shinohara 3 way turnout (my layout is all Shinohara), the track spacing on the frogs was just too much, and situated such that the little teakettle would stop.

The 4-4-0 went back to the test stand, and I trimmed the BULLFROG SNOT off the driver flanges, leaving a traction tire to contact the rail tops. This cured the stalling issue. Remarkably easy too.

So, before you think you've overdone the BULLFROG SNOT, try the simple tuning trick of clearing the flanges. You'll be pleased with the result.