Comment on PRR superpower generation 3: T1 and cousins by mrbill6ishere
Now we need a 4-4-4-6 
I can see it now. Roughly the DBHP of an Allegheny at over 120 MPH!!!
And all of the soap it's making greasing the rails, LOL. 
I don't know, I think we need a 4-8-4 with a belpaire firebox, three cylinders, truck boosters, poppet valves, and all-weather cabs, also cupholders...cupholders would be nice...