The good news is that the pulling power did increase. It was able to pull 7 cars on the level track. It may even be able to do 8. However, curve drag and grades still take their toll. Curve drag especially seems to have an effect.
An effective working train length for this engine over the whole layout would be more like 4 cars. Note that the overall design train length is 7 cars due to siding lengths. If I relegate Osceola to Aquia Landing as a yard switcher, it might be able to do the job switching 6 or 7 cars on the flat lands.
I made a short video in a silent film style. Since the locomotive still has a diesel decoder, there was no sense listening to that.
What do you think? It is a neat looking locomotive. Watch the valve gear "operate" as it moves.
On a whim I tried to double head it with another engine and I learned that doesn't work. I forgot that these are brass engines. The tender frames have opposite electrical polarity from the engines. So using the metal front link causes a short.
I will test again when the new decoder, speaker and tungsten weights arrive.