I'm glad you did't mention that! This is my finding too. 34theletterbetweenB&D pointed me in that direction. A few guys have fitted Ultrascale wheels to stuff and reporrted a 20% increase in load hauling. I find a lump of lead is cheaper but Ultrascale wheels look wonderful.
Nice pic as is http://www.robertdar...ailways50yr.htm scroll down to 44424 on Saturday, 17th August.1957.