I read the first line, about some engines are just naturally slippery, and didn't focus on the rest of it. If I'd noticed it was you, I most likely would have read the rest.
Originally Posted by gunrunnerjohn:
Originally Posted by Southwest Hiawatha:
Here are a few ideas that haven't been mentioned yet. First, check the spring tension on the pickup rollers and the trailing truck, if it has a spring to hold it down. If the pickup roller springs are too stiff, they will exert a lifting force on the drivers, reducing traction. The same goes for the trailing truck. I have a brass 4-6-4 that came from the factory with a spring so stiff pushing down on the trailing truck that it lifted the rear drivers. A softer spring fixed the problem.
See my post yesterday. 
